50278 + Interview Questions in Physics

1.	The binding energy of a deuteron H2 is 1.15 MeV per nucleon & that of an alpha particle is 7.1 Mev per nucleon. Then in the reaction H2+H2→He4+Q, the energy Q released is approximately
Answer» The binding energy of a deuteron $H^{2}$ is 1.15 MeV per nucleon & that of an alpha particle is 7.1 Mev per nucleon. Then in the reaction $H^{2} + H^{2} \to H e^{4} + Q,$ the energy Q released is approximately

Discussion

2.	A magnet of magnetic moment M oscillating freely in earth's horizontal magnetic field makes n oscillations per minute. If the magetic moment is quadrupled and the earth's field is doubled, the numbers of oscillations made per minute would be:
Answer» A magnet of magnetic moment $M$ oscillating freely in earth's horizontal magnetic field makes $n$ oscillations per minute. If the magetic moment is quadrupled and the earth's field is doubled, the numbers of oscillations made per minute would be:

Discussion

3.	A telephone link operating at a central frequency of 10 GHz is established. If 1% of this is available, then how many telephone channel can be simultaneously given when each telephone covering a band width of 5 kHz ?
Answer» A telephone link operating at a central frequency of $10 G H z$ is established. If 1% of this is available, then how many telephone channel can be simultaneously given when each telephone covering a band width of $5 k H z$ ?

Discussion

4.	A ball is thrown upwards from the foot of a tower. The ball crosses the top of tower twice after an interval of 4 seconds and the ball reaches ground after 8 seconds, then the height of tower in meters is 10x. Then the value of x is . (g=10m/s2)
Answer» A ball is thrown upwards from the foot of a tower. The ball crosses the top of tower twice after an interval of 4 seconds and the ball reaches ground after 8 seconds, then the height of tower in meters is 10x. Then the value of x is . $(g = 10 m / s^{2})$

Discussion

5.	A string of length L is stretched by L20 and speed of transverse wave along it is v. The speed of wave when it is stretched by L10 will be (assume that Hooke's law is applicable)
Answer» A string of length $L$ is stretched by $\frac{L}{20}$ and speed of transverse wave along it is $v .$ The speed of wave when it is stretched by $\frac{L}{10}$ will be (assume that Hooke's law is applicable)

Discussion

6.	An electron, an alpha particle, a proton and a neutron have same de-Broglie wavelength. What would be the order of their kinetic energies ?
Answer» An electron, an alpha particle, a proton and a neutron have same de-Broglie wavelength. What would be the order of their kinetic energies ?

Discussion

7.	∫ex4(x+x3+2x5)ex2dx is equal to
Answer» $\int e^{x^{4}} (x + x^{3} + 2 x^{5}) e^{x^{2}} d x$ is equal to

Discussion

8.	Calculate the value of V0, if the silicon and germanium diode, start conducting at 0.7 V and 0.3 V respectively, in the given circuit. If the Ge diode connection be reversed, what will be the new values of V0.
Answer» Calculate the value of $V_{0}$ , if the silicon and germanium diode, start conducting at $0.7 V$ and $0.3 V$ respectively, in the given circuit. If the Ge diode connection be reversed, what will be the new values of $V_{0}$ .

Discussion

9.	A block of mass m and length l and height h is kept at rest on a rough inclined plane of inclination Alpha with the horizontal as shown .if new is the coefficient of friction between the block and the inclined plane then the block topples over if
Answer» A block of mass m and length l and height h is kept at rest on a rough inclined plane of inclination Alpha with the horizontal as shown .if new is the coefficient of friction between the block and the inclined plane then the block topples over if

Discussion

10.	A ball is thrown vertically downward from a height 10m with an initial velocity v0. It collides to ground and bounces back to the same height. What height will it rebound to, had it been thrown vertically upward with the same speed :-(1)5m (2)10m (3)15m (4)20m
Answer» A ball is thrown vertically downward from a height 10m with an initial velocity v0. It collides to ground and bounces back to the same height. What height will it rebound to, had it been thrown vertically upward with the same speed :- (1)5m (2)10m (3)15m (4)20m

Discussion

11.	Find the work done in bringing three particles each having a mass of100gm from large distance to the vertices of equilateral triangle of side 20cm?
Answer» Find the work done in bringing three particles each having a mass of100gm from large distance to the vertices of equilateral triangle of side 20cm?

Discussion

12.	A pendulum 36 cm long oscillates through an angle of 10 degrees. Find the length of the path described by its extremity.
Answer» A pendulum 36 cm long oscillates through an angle of 10 degrees. Find the length of the path described by its extremity.

Discussion

13.	Vector →a,→b,→c are three non-zero vectors such that (→a−→b).→c=0. Let →a×(→b×→c)+→b×(→c×→a)=(4+x2)→b−(4xcos2θ)→a, where →a and →b are non-collinear vectors and x>0,0<θ<10, then number of different vales of θ will be
Answer» Vector $\to a, \to b, \to c$ are three non-zero vectors such that $(\to a - \to b) . \to c = 0.$ Let $\to a \times (\to b \times \to c) + \to b \times (\to c \times \to a) = (4 + x^{2}) \to b - (4 x {cos}^{2} θ) \to a,$ where $\to a$ and $\to b$ are non-collinear vectors and $x > 0, 0 < θ < 10,$ then number of different vales of $θ$ will be

Discussion

14.	A radioactive sample undergoes decay as per the following graph. Dotted line represents the slope of the curve at t = 0. If this dotted line intersects the time axis at t = T, choose the correct alternative (Given t12=half life,tavg= mean life)
Answer» A radioactive sample undergoes decay as per the following graph. Dotted line represents the slope of the curve at t = 0. If this dotted line intersects the time axis at t = T, choose the correct alternative (Given $t_{\frac{1}{2}} =$ half life, $t_{a v g} =$ mean life)

Discussion

15.	for the two angles of incidence differing by 20 degree,an equilateral prism deviates a ray through 40 degree.the value of angle of in incidence is
Answer» for the two angles of incidence differing by 20 degree,an equilateral prism deviates a ray through 40 degree.the value of angle of in incidence is

Discussion

16.	Question 4 (c)Fill in the blank with a suitable word.The unit of frequency is _________.
Answer» Question 4 (c) Fill in the blank with a suitable word. The unit of frequency is _________.

Discussion

17.	Suppose there existed a planet that went around the sun twice as fast as the earth. What would be its orbital size as compared to that of the earth ?
Answer» Suppose there existed a planet that went around the sun twice as fast as the earth. What would be its orbital size as compared to that of the earth ?

Discussion

18.	8. A square wire frame of side / is floating on the surface of liquid of surface tension T. The force required to pullout the frame from the liquid is(1) TI(3) 4TI(2) 2 TI(4) 877d nonlorce to form a single drop, In this process, eneray is
Answer» 8. A square wire frame of side / is floating on the surface of liquid of surface tension T. The force required to pullout the frame from the liquid is(1) TI(3) 4TI(2) 2 TI(4) 877d nonlorce to form a single drop, In this process, eneray is

Discussion

19.	A hollow pipe of length 0.8 m is closed at one end. At its open end a 0.5 m long uniform string (fixed at both ends) is vibrating in its second harmonic and it resonates with the fundamental frequency of the pipe. If the tension in the wire is 50 N and the speed of sound is 320 ms−1, the mass of the string is
Answer» A hollow pipe of length $0.8 m$ is closed at one end. At its open end a $0.5 m$ long uniform string (fixed at both ends) is vibrating in its second harmonic and it resonates with the fundamental frequency of the pipe. If the tension in the wire is $50 N$ and the speed of sound is $320 {ms}^{- 1}$ , the mass of the string is

Discussion

20.	An ideal CO2 gas obeys the law PVx= constant. The range of x for which the gas has non-positive molar specific heat at normal temperature is
Answer» An ideal $C O_{2}$ gas obeys the law $P V^{x} =$ constant. The range of $x$ for which the gas has non-positive molar specific heat at normal temperature is

Discussion

21.	A man is pushing the box up along an inclined plane as shown. Its free body diagram will be:
Answer» A man is pushing the box up along an inclined plane as shown. Its free body diagram will be:

Discussion

22.	In the figure, the load P = 1 N, length L = 1m Young's modulus E = 50 GPa, and the cross section of the links is a square with dimension 10 mm X 10 mm. All joints are pin joints.The stress (in Pa) in the AB is (Indicate compressive stress by a negative so, and tensile stress by a positive sign)
Answer» In the figure, the load P = 1 N, length L = 1m Young's modulus E = 50 GPa, and the cross section of the links is a square with dimension 10 mm X 10 mm. All joints are pin joints. The stress (in Pa) in the AB is (Indicate compressive stress by a negative so, and tensile stress by a positive sign)

Discussion

23.	A conducting rod of length ℓ is moved at constant velocity ‘V′0 on two parallel, conducting, smooth, fixed rails that are placed in a uniform constant magnetic field B perpendicular to the plane of the rails as shown in figure. A resistance R is connected between the two ends of the rail. Then which of the following is/are correct :
Answer» A conducting rod of length $ℓ$ is moved at constant velocity $‘ V_{0}^{'}$ on two parallel, conducting, smooth, fixed rails that are placed in a uniform constant magnetic field B perpendicular to the plane of the rails as shown in figure. A resistance R is connected between the two ends of the rail. Then which of the following is/are correct :

23.

A conducting rod of length ℓ is moved at constant velocity ‘V′0 on two parallel, conducting, smooth, fixed rails that are placed in a uniform constant magnetic field B perpendicular to the plane of the rails as shown in figure. A resistance R is connected between the two ends of the rail. Then which of the following is/are correct :

Answer»

A conducting rod of length $ℓ$ is moved at constant velocity $‘ V_{0}^{'}$ on two parallel, conducting, smooth, fixed rails that are placed in a uniform constant magnetic field B perpendicular to the plane of the rails as shown in figure. A resistance R is connected between the two ends of the rail. Then which of the following is/are correct :

Discussion

24.	A motor can pump the water upto maximum height of 10m at the rate of 10 kg per sec. If efficiency of the motor is 0.8 then power of motor i
Answer» A motor can pump the water upto maximum height of 10m at the rate of 10 kg per sec. If efficiency of the motor is 0.8 then power of motor i

Discussion

25.	If an isolated capacitor loses energy when a dielectric is introduced, where does that energy go?
Answer» If an isolated capacitor loses energy when a dielectric is introduced, where does that energy go?

Discussion

26.	A column having its both ends hinged having length l, moment of inertia I, modulus of elasticity E, is subjected to axial loading only. What is the ratio of load when the column gets deflected in fundamental mode to second harmonic mode?
Answer» A column having its both ends hinged having length $l$ , moment of inertia $I$ , modulus of elasticity $E$ , is subjected to axial loading only. What is the ratio of load when the column gets deflected in fundamental mode to second harmonic mode?

Discussion

27.	Two rods of identical dimension with youngs modulli Y1 and Y2 are joined end to end . The equivalent youngs modulus for the composite rod is (if the equivalent rod is also having same dimension as of the original rods)
Answer» Two rods of identical dimension with youngs modulli Y1 and Y2 are joined end to end . The equivalent youngs modulus for the composite rod is (if the equivalent rod is also having same dimension as of the original rods)

Discussion

28.	What is the dimensional formula for g
Answer» What is the dimensional formula for g

Discussion

29.	The position of the particle is given by x=t2+5t+2 in m. The average speed of the particle in 6 sec is
Answer» The position of the particle is given by $x = t^{2} + 5 t + 2$ in $m$ . The average speed of the particle in $6 sec$ is

Discussion

30.	Current density in a wire varies with r (distance from the centre) according to the relation, J=kr2. Here, k is a constant. What will be the magnitude of magnetic field at a distance R (R<a) from the centre?[a is the radius of the wire]
Answer» Current density in a wire varies with $r$ $($ distance from the centre $)$ according to the relation, $J = k r^{2}$ . Here, $k$ is a constant. What will be the magnitude of magnetic field at a distance $R (R < a)$ from the centre? $[a$ is the radius of the wire $]$

Discussion

31.	9.The force on a charged particle due to electric charge and magnetic field is given by 'vector F=q vectorE+q vector vvector B. Suppose vector E is along X axis and B along Y axis. In what direction and with what minimum speed 'v'should a positively charged particle be sent so that the net force on it is 0?
Answer» 9.The force on a charged particle due to electric charge and magnetic field is given by 'vector F=q vectorE+q vector vvector B. Suppose vector E is along X axis and B along Y axis. In what direction and with what minimum speed 'v'should a positively charged particle be sent so that the net force on it is 0?

Discussion

32.	In the given figure, all the batteries are ideal. Find the value of i (in ampere)
Answer» In the given figure, all the batteries are ideal. Find the value of $i$ (in ampere)

Discussion

33.	What is the use of sodium vapour gas and Mercury vapour gas?
Answer» What is the use of sodium vapour gas and Mercury vapour gas?

Discussion

34.	A hollow cylinder drum or radius r is placed with its axis vertical. It is rotated about an axis passing through its centre and perpendicular to the base and a body is placed on the inside surface of the drum. If the coefficient of friction is, the minimum frequency of revolution so that the body does not fall down is
Answer» A hollow cylinder drum or radius r is placed with its axis vertical. It is rotated about an axis passing through its centre and perpendicular to the base and a body is placed on the inside surface of the drum. If the coefficient of friction is, the minimum frequency of revolution so that the body does not fall down is

Discussion

35.	Each capacitor shown in the figure has a capacitance of 10 μF. The emf of the battery is 1 V. How much extra charge will flow through AB if the switch S is closed?
Answer» Each capacitor shown in the figure has a capacitance of $10 μ F$ . The emf of the battery is $1 V$ . How much extra charge will flow through $AB$ if the switch $S$ is closed?

Discussion

36.	A force acts on a 2 kg object so that its position is given as a function of time as x=3t2+5. What is the work done by this force in first 5 seconds ?
Answer» A force acts on a $2 kg$ object so that its position is given as a function of time as $x = 3 t^{2} + 5$ . What is the work done by this force in first $5$ seconds ?

Discussion

37.	Two capacitors each having capacitance 2 μF and breakdown voltage 1.5 V are joined in series. The breakdown voltage of the combination will be
Answer» Two capacitors each having capacitance $2 μ F$ and breakdown voltage $1.5 V$ are joined in series. The breakdown voltage of the combination will be

Discussion

38.	The current through the 5 Ω resistor is
Answer» The current through the $5 Ω$ resistor is

Discussion

39.	In a two winding transformer with a laminated core, the winding with N1=200 turns is connected to a voltage to produce a flux density in the core B = 1.2 sin 377t. The second winding with N2=400 turns, is left open circuited. The stacking factor of the core is 0.95 i.e., the core occupies 95% of the gross core volume. The gross cross sectional area of the core is 25 cm2 and μr for the core is 10000. The core length lc=90 cm. The rms value of the applied voltage is ___________V.(Neglect primary impedance)151.95
Answer» In a two winding transformer with a laminated core, the winding with $N_{1} = 200$ turns is connected to a voltage to produce a flux density in the core B = 1.2 sin 377t. The second winding with $N_{2} = 400$ turns, is left open circuited. The stacking factor of the core is 0.95 i.e., the core occupies 95% of the gross core volume. The gross cross sectional area of the core is 25 cm $^{2}$ and $μ_{r}$ for the core is 10000. The core length $l_{c} = 90 c m$ . The rms value of the applied voltage is ___________V. (Neglect primary impedance) 151.95

Discussion

40.	Find the time required for a 50Hz A.C. to change its value from zero to rms value
Answer» Find the time required for a 50Hz A.C. to change its value from zero to rms value

Discussion

41.	A particle of mass 'm' and charge 'q' is accelerated through a potential difference of 'V' volt. Its energy is
Answer» A particle of mass 'm' and charge 'q' is accelerated through a potential difference of 'V' volt. Its energy is

Discussion

42.	a sphere of radius 1cm has potential of 8000V then energy density near its surface will be
Answer» a sphere of radius 1cm has potential of 8000V then energy density near its surface will be

Discussion

43.	What is the difference between electrostatic potential energy and gravitational potential energy?
Answer» What is the difference between electrostatic potential energy and gravitational potential energy?

Discussion

44.	Magnetic fields at two points on the axis of a circular coil at a distance of 0.05 m and 0.2 m from the centre are in the ratio 8:1. The radius of coil is :
Answer» Magnetic fields at two points on the axis of a circular coil at a distance of $0.05 m$ and $0.2 m$ from the centre are in the ratio $8 : 1$ . The radius of coil is :

Discussion

45.	An amplitude modulated signal is given by V(t)=10[1+0.3cos(2.2×104t)]sin(5.5×105t). Here t is in seconds. The sideband frequencies (in kHz) are, [Given π=227]
Answer» An amplitude modulated signal is given by $V (t) = 10 [1 + 0.3 cos (2.2 \times 10^{4} t)] sin (5.5 \times 10^{5} t) .$ Here $t$ is in seconds. The sideband frequencies $(in kHz)$ are, $[Given π = \frac{22}{7}]$

Discussion

46.	A square frame with side length l has total resistance R. It is being pulled with speed v out of region of uniform magnetic field B. Moment when left corner is at distance x inside field, the force required to pull frame at constant speed v is
Answer» A square frame with side length $l$ has total resistance $R$ . It is being pulled with speed $v$ out of region of uniform magnetic field $B$ . Moment when left corner is at distance $x$ inside field, the force required to pull frame at constant speed $v$ is

Discussion

47.	When a sinusodial carrier signal is amplitude modulated by a siusodial message signalm1(t),the modulation index of the resultant AM signal is 0.80. When this AM signal issimultaneously modulated by one more sinusoidal message signalm2(t)the total power ofthe Am signal become double. The modulation index of the Am signal obtained due to m2(t)alone will be_______1.625
Answer» $When a sinusodial carrier signal is amplitude modulated by a siusodial message signal m_{1} (t), the modulation index of the resultant AM signal is 0.80. When this AM signal is simultaneously modulated by one more sinusoidal message signal m_{2} (t) the total power of the Am signal become double. The modulation index of the Am signal obtained due to m_{2} (t) alone will be_______$ 1.625

Discussion

48.	a particle is projected upwards with a velocity of 100m/s at an angle of 60 with the vertical. find the time when the particle will move perpendicular to its intial direction, taking g
Answer» a particle is projected upwards with a velocity of 100m/s at an angle of 60 with the vertical. find the time when the particle will move perpendicular to its intial direction, taking g

Discussion

49.	A thin rod of mass m and length l is suspended from one of its ends. It is set into oscillation about a horizontal axis and its angular speed is Omega while passing through its mean position. How high will its centre of mass rise from its lowest position?
Answer» A thin rod of mass m and length l is suspended from one of its ends. It is set into oscillation about a horizontal axis and its angular speed is Omega while passing through its mean position. How high will its centre of mass rise from its lowest position?

Discussion

50.	A particle of mass m is at rest at the origin at time t=0. It is subjected to a force F(t)=F0e−bt in the x direction. Its speed v(t) is depicted by which of the following curves?
Answer» A particle of mass $m$ is at rest at the origin at time $t = 0$ . It is subjected to a force $F (t) = F_{0} e^{- b t}$ in the $x$ direction. Its speed $v (t)$ is depicted by which of the following curves?

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

The binding energy of a deuteron H2 is 1.15 MeV per nucleon &amp; that of an alpha particle is 7.1 Mev per nucleon. Then in the reaction H2+H2→He4+Q, the energy Q released is approximately

A magnet of magnetic moment M oscillating freely in earth's horizontal magnetic field makes n oscillations per minute. If the magetic moment is quadrupled and the earth's field is doubled, the numbers of oscillations made per minute would be:

A telephone link operating at a central frequency of 10 GHz is established. If 1% of this is available, then how many telephone channel can be simultaneously given when each telephone covering a band width of 5 kHz ?

A ball is thrown upwards from the foot of a tower. The ball crosses the top of tower twice after an interval of 4 seconds and the ball reaches ground after 8 seconds, then the height of tower in meters is 10x. Then the value of x is . (g=10m/s2)

A string of length L is stretched by L20 and speed of transverse wave along it is v. The speed of wave when it is stretched by L10 will be (assume that Hooke's law is applicable)

An electron, an alpha particle, a proton and a neutron have same de-Broglie wavelength. What would be the order of their kinetic energies ?

∫ex4(x+x3+2x5)ex2dx is equal to

Calculate the value of V0, if the silicon and germanium diode, start conducting at 0.7 V and 0.3 V respectively, in the given circuit. If the Ge diode connection be reversed, what will be the new values of V0.

A block of mass m and length l and height h is kept at rest on a rough inclined plane of inclination Alpha with the horizontal as shown .if new is the coefficient of friction between the block and the inclined plane then the block topples over if

A ball is thrown vertically downward from a height 10m with an initial velocity v0. It collides to ground and bounces back to the same height. What height will it rebound to, had it been thrown vertically upward with the same speed :-(1)5m (2)10m (3)15m (4)20m

Find the work done in bringing three particles each having a mass of100gm from large distance to the vertices of equilateral triangle of side 20cm?

A pendulum 36 cm long oscillates through an angle of 10 degrees. Find the length of the path described by its extremity.

Vector →a,→b,→c are three non-zero vectors such that (→a−→b).→c=0. Let →a×(→b×→c)+→b×(→c×→a)=(4+x2)→b−(4xcos2θ)→a, where →a and →b are non-collinear vectors and x&gt;0,0&lt;θ&lt;10, then number of different vales of θ will be

A radioactive sample undergoes decay as per the following graph. Dotted line represents the slope of the curve at t = 0. If this dotted line intersects the time axis at t = T, choose the correct alternative (Given t12=half life,tavg= mean life)

for the two angles of incidence differing by 20 degree,an equilateral prism deviates a ray through 40 degree.the value of angle of in incidence is

Question 4 (c)Fill in the blank with a suitable word.The unit of frequency is _________.

Suppose there existed a planet that went around the sun twice as fast as the earth. What would be its orbital size as compared to that of the earth ?

8. A square wire frame of side / is floating on the surface of liquid of surface tension T. The force required to pullout the frame from the liquid is(1) TI(3) 4TI(2) 2 TI(4) 877d nonlorce to form a single drop, In this process, eneray is

An ideal CO2 gas obeys the law PVx= constant. The range of x for which the gas has non-positive molar specific heat at normal temperature is

A man is pushing the box up along an inclined plane as shown. Its free body diagram will be:

In the figure, the load P = 1 N, length L = 1m Young's modulus E = 50 GPa, and the cross section of the links is a square with dimension 10 mm X 10 mm. All joints are pin joints.The stress (in Pa) in the AB is (Indicate compressive stress by a negative so, and tensile stress by a positive sign)

A motor can pump the water upto maximum height of 10m at the rate of 10 kg per sec. If efficiency of the motor is 0.8 then power of motor i

If an isolated capacitor loses energy when a dielectric is introduced, where does that energy go?

A column having its both ends hinged having length l, moment of inertia I, modulus of elasticity E, is subjected to axial loading only. What is the ratio of load when the column gets deflected in fundamental mode to second harmonic mode?

Two rods of identical dimension with youngs modulli Y1 and Y2 are joined end to end . The equivalent youngs modulus for the composite rod is (if the equivalent rod is also having same dimension as of the original rods)

What is the dimensional formula for g

The position of the particle is given by x=t2+5t+2 in m. The average speed of the particle in 6 sec is

Current density in a wire varies with r (distance from the centre) according to the relation, J=kr2. Here, k is a constant. What will be the magnitude of magnetic field at a distance R (R&lt;a) from the centre?[a is the radius of the wire]

In the given figure, all the batteries are ideal. Find the value of i (in ampere)

What is the use of sodium vapour gas and Mercury vapour gas?

Each capacitor shown in the figure has a capacitance of 10 μF. The emf of the battery is 1 V. How much extra charge will flow through AB if the switch S is closed?

A force acts on a 2 kg object so that its position is given as a function of time as x=3t2+5. What is the work done by this force in first 5 seconds ?

Two capacitors each having capacitance 2 μF and breakdown voltage 1.5 V are joined in series. The breakdown voltage of the combination will be

The current through the 5 Ω resistor is

Find the time required for a 50Hz A.C. to change its value from zero to rms value

A particle of mass 'm' and charge 'q' is accelerated through a potential difference of 'V' volt. Its energy is

a sphere of radius 1cm has potential of 8000V then energy density near its surface will be

What is the difference between electrostatic potential energy and gravitational potential energy?

Magnetic fields at two points on the axis of a circular coil at a distance of 0.05 m and 0.2 m from the centre are in the ratio 8:1. The radius of coil is :

An amplitude modulated signal is given by V(t)=10[1+0.3cos(2.2×104t)]sin(5.5×105t). Here t is in seconds. The sideband frequencies (in kHz) are, [Given π=227]

A square frame with side length l has total resistance R. It is being pulled with speed v out of region of uniform magnetic field B. Moment when left corner is at distance x inside field, the force required to pull frame at constant speed v is

a particle is projected upwards with a velocity of 100m/s at an angle of 60 with the vertical. find the time when the particle will move perpendicular to its intial direction, taking g

A thin rod of mass m and length l is suspended from one of its ends. It is set into oscillation about a horizontal axis and its angular speed is Omega while passing through its mean position. How high will its centre of mass rise from its lowest position?

A particle of mass m is at rest at the origin at time t=0. It is subjected to a force F(t)=F0e−bt in the x direction. Its speed v(t) is depicted by which of the following curves?

The binding energy of a deuteron H2 is 1.15 MeV per nucleon & that of an alpha particle is 7.1 Mev per nucleon. Then in the reaction H2+H2→He4+Q, the energy Q released is approximately

Vector →a,→b,→c are three non-zero vectors such that (→a−→b).→c=0. Let →a×(→b×→c)+→b×(→c×→a)=(4+x2)→b−(4xcos2θ)→a, where →a and →b are non-collinear vectors and x>0,0<θ<10, then number of different vales of θ will be

Current density in a wire varies with r (distance from the centre) according to the relation, J=kr2. Here, k is a constant. What will be the magnitude of magnetic field at a distance R (R<a) from the centre?[a is the radius of the wire]