50278 + Interview Questions in Physics

1.	The edges of a parallelepiped are given by the vectors (3 ^i+3^j+6^k), 4^j and 8^j+m^k. What should be the value of m in order that the volume of the parallelepiped be 60?
Answer» The edges of a parallelepiped are given by the vectors $(3^i + 3^j + 6^k), 4^j$ and $8^j + m^k .$ What should be the value of $m$ in order that the volume of the parallelepiped be 60?

Discussion

2.	The graph shows the behaviour of a length of wire in the region for which the substance obeys Hook's law. P and Q represent
Answer» The graph shows the behaviour of a length of wire in the region for which the substance obeys Hook's law. P and Q represent

2.

The graph shows the behaviour of a length of wire in the region for which the substance obeys Hook's law. P and Q represent

Answer»

The graph shows the behaviour of a length of wire in the region for which the substance obeys Hook's law. P and Q represent

Discussion

3.	Six forces, 9.81 N each, acting at a point are coplanar. If the angles between neighbouring forces are equal, then the resultant is
Answer» Six forces, $9.81 N$ each, acting at a point are coplanar. If the angles between neighbouring forces are equal, then the resultant is

Discussion

4.	Why electron can't exist in nucleus of atom?
Answer» Why electron can't exist in nucleus of atom?

Discussion

5.	nta uniform magnetic field of 1.5 T exists in a cylindrical region of radius 10cm ,its direction parallel to axis along east to west . a wire carryingacurrent of 7A in the north to south direcction passes through this region .what iis magnitude and direction of force on the wire ifn ntwire intersect the axisn ntwire is turned fromNS to north east north west directionn ntwire inNS direction is lowered from the axis by a distance of 6cmn
Answer» nta uniform magnetic field of 1.5 T exists in a cylindrical region of radius 10cm ,its direction parallel to axis along east to west . a wire carryingacurrent of 7A in the north to south direcction passes through this region .what iis magnitude and direction of force on the wire ifn ntwire intersect the axisn ntwire is turned fromNS to north east north west directionn ntwire inNS direction is lowered from the axis by a distance of 6cmn

Discussion

6.	when the light frequency 2vo(where vo is threshold frequency) is incident on a metal plate, the maximum velocity of electrons emitted is v1. when the frequency of the incident radiation is increased to 5vo, the maximum velocity of electrons emitted fromthe same platev2. the ratio of v1 to v2
Answer» when the light frequency 2vo(where vo is threshold frequency) is incident on a metal plate, the maximum velocity of electrons emitted is v1. when the frequency of the incident radiation is increased to 5vo, the maximum velocity of electrons emitted fromthe same platev2. the ratio of v1 to v2

Discussion

7.	What will happen if two soap bubbles of different radii are connected by a tube?
Answer» What will happen if two soap bubbles of different radii are connected by a tube?

Discussion

8.	Magnification of a compound microscope is 30. Focal length of eyepiece is 5 cm and the final image is formed at the least distance of distinct vision. Find the magnification of objective lens.
Answer» Magnification of a compound microscope is $30$ . Focal length of eyepiece is $5 cm$ and the final image is formed at the least distance of distinct vision. Find the magnification of objective lens.

Discussion

9.	Three identical bodies each of mass M are placed at vertices of an equilateral triangle of arm L keeping the triangle as such by which speed bodies should be rotated in their gravitational fields so that the particle moves along the circumference of circular orbit
Answer» Three identical bodies each of mass M are placed at vertices of an equilateral triangle of arm L keeping the triangle as such by which speed bodies should be rotated in their gravitational fields so that the particle moves along the circumference of circular orbit

Discussion

10.	A parallel plate capacitor of area A and separation d is fully charged to potential difference V and then removed from charging source. A dielectric slab of dielectric constant K=2, thickness d and area A/2 is inserted as shown in figure. Let σ1 be the free charge density at the conductor-dielectric surface, σ2 be the charge density at the conductor- vacuum surface. The value of new capacitance and potential difference respectively are
Answer» A parallel plate capacitor of area $A$ and separation $d$ is fully charged to potential difference $V$ and then removed from charging source. A dielectric slab of dielectric constant $K = 2$ , thickness $d$ and area $A / 2$ is inserted as shown in figure. Let $σ_{1}$ be the free charge density at the conductor-dielectric surface, $σ_{2}$ be the charge density at the conductor- vacuum surface. The value of new capacitance and potential difference respectively are

Discussion

11.	The period of a particle in SHM is 8 s. At t=0, it is at the mean position. The ratio of the distance travelled by it in the 1st and the 2nd second is
Answer» The period of a particle in SHM is $8 s$ . At $t = 0$ , it is at the mean position. The ratio of the distance travelled by it in the $1^{st}$ and the $2^{nd}$ second is

Discussion

12.	A projectile takes off with an initial velocity of 20 m/s at an angle of elevation of 45∘. It is just able to clear two hurdles of height 4 m each, separated from each other by a distance d. What is the value of d? (Take g=10 m/s2)
Answer» A projectile takes off with an initial velocity of $20 m/s$ at an angle of elevation of $45^{\circ}$ . It is just able to clear two hurdles of height $4 m$ each, separated from each other by a distance $d$ . What is the value of $d$ ? (Take $g = 10 {m/s}^{2}$ )

Discussion

13.	A horizontal platform is executing simple harmonic motion in the vertical direction of frequency v. A block of mass m is placed on the platform. What is the maximum amplitude of the platform so that the block is not detached from it ?
Answer» A horizontal platform is executing simple harmonic motion in the vertical direction of frequency v. A block of mass m is placed on the platform. What is the maximum amplitude of the platform so that the block is not detached from it ?

Discussion

14.	Water flows through a 60 cm diameter, 1 km long pipe from a 30 m head of over tank to a village. Ignore minor losses. Fanning friction factor =0.04. The discharge (cumec) at the village ground level is
Answer» Water flows through a 60 cm diameter, 1 km long pipe from a 30 m head of over tank to a village. Ignore minor losses. Fanning friction factor =0.04. The discharge (cumec) at the village ground level is

Discussion

15.	A 5kg block is resting on a frictionless plane. It is struck by a jet, releasing water at the rate of 3kg/s emerging with a a speed of 4m/s. Calculate the initial acceleration of the block
Answer» A 5kg block is resting on a frictionless plane. It is struck by a jet, releasing water at the rate of 3kg/s emerging with a a speed of 4m/s. Calculate the initial acceleration of the block

Discussion

16.	A force F=(^i+4^j) N acts on the block shown. The force of friction acting on the block is :
Answer» A force $F = (^i + 4^j) N$ acts on the block shown. The force of friction acting on the block is :

Discussion

17.	a cell delivers equal power to load resistances R1 and R2 individually. the value of internal resistance of the cell is R1+R2 R1R2/R2+R2 R1R2 R1R2/2
Answer» a cell delivers equal power to load resistances R1 and R2 individually. the value of internal resistance of the cell is R1+R2 R1R2/R2+R2 R1R2 R1R2/2

Discussion

18.	out NO_{2 }and CO_{2_{}} which is more acidic and why
Answer» out NO_{2 }and CO_{2_{}} which is more acidic and why

Discussion

19.	Two concentric spherical shells have masses M1 and M2 and radii R1 and R2 (R1<R2). What is the force exerted by this system on a particle of mass m if it is at a distance (R1+R2)2 from the centre?
Answer» Two concentric spherical shells have masses $M_{1}$ and $M_{2}$ and radii $R_{1}$ and $R_{2}$ $(R_{1} < R_{2})$ . What is the force exerted by this system on a particle of mass $m$ if it is at a distance $\frac{(R_{1} + R_{2})}{2}$ from the centre?

Discussion

20.	What do we mean when we say there is potential drop across that resistance in case of current .. and how it is different from concept of potential that is explained in electrostatic . Can i get an intuitive picture for that ..
Answer» What do we mean when we say there is potential drop across that resistance in case of current .. and how it is different from concept of potential that is explained in electrostatic . Can i get an intuitive picture for that ..

20.

What do we mean when we say there is potential drop across that resistance in case of current .. and how it is different from concept of potential that is explained in electrostatic . Can i get an intuitive picture for that ..

Answer»

What do we mean when we say there is potential drop across that resistance in case of current .. and how it is different from concept of potential that is explained in electrostatic

. Can i get an intuitive picture for that ..

Discussion

21.	What is the definition of approximation with respect to differentiation ?
Answer» What is the definition of approximation with respect to differentiation ?

Discussion

22.	Unpolarised light of intensity 32Wm−2 passes through three polarisers such that the transmission axis of the last polarizer is perpendicular to that of the first. At what angle will the transmitted intensity be maximum?
Answer» Unpolarised light of intensity $32 W m^{- 2}$ passes through three polarisers such that the transmission axis of the last polarizer is perpendicular to that of the first. At what angle will the transmitted intensity be maximum?

Discussion

23.	The length(in units) of vector 2→a+3→b, such that A=(1,1,−1) and B=(2,0,0)(where →a,→b are position vectors of −−→OA,−−→OB respectively)
Answer» The length(in units) of vector $2 \to a + 3 \to b,$ such that $A = (1, 1, - 1)$ and $B = (2, 0, 0)$ (where $\to a, \to b$ are position vectors of $- - \to O A, - - \to O B$ respectively)

Discussion

24.	Three identical capacitors with same plate area and same plate separation of 1mm are filled with dielectrics of dielectric constant k1,k2 and k3 having dielectric breakdown of E1,E2 and E3 respectively are arranged as shown in figure. Given : k1=2 ,E1=3×106v/m k2=4 ,E2=20×106v/m k3=5 ,E3=5×106v/m Maximum value of Eo is n×103 Volts, then n is
Answer» Three identical capacitors with same plate area and same plate separation of 1mm are filled with dielectrics of dielectric constant $k_{1}, k_{2}$ and $k_{3}$ having dielectric breakdown of $E_{1}, E_{2} a n d E_{3}$ respectively are arranged as shown in figure. Given : $k_{1} = 2, E_{1} = 3 \times 10^{6} v / m$ $k_{2} = 4, E_{2} = 20 \times 10^{6} v / m$ $k_{3} = 5, E_{3} = 5 \times 10^{6} v / m$ Maximum value of $E_{o}$ is $n \times 10^{3}$ Volts, then n is

Discussion

25.	Two point charges 2 μC and 8μC are placed 12 cm apart. The position of point from 2 μC charge, where the electric field intensity is zero is:
Answer» Two point charges 2 μC and 8μC are placed 12 cm apart. The position of point from 2 μC charge, where the electric field intensity is zero is:

Discussion

26.	In hydrogen atom, the de-broglie wavelength of an electron in the 2nd bohr orbit is-? ( bohr radius=52.9pm)
Answer» In hydrogen atom, the de-broglie wavelength of an electron in the 2nd bohr orbit is-? ( bohr radius=52.9pm)

Discussion

27.	calulate the field due to an electric dipole of length 10cm and consisting of charge of \pm100micro coulomb at apoint 20 cm from each charge .
Answer» calulate the field due to an electric dipole of length 10cm and consisting of charge of \pm100micro coulomb at apoint 20 cm from each charge .

Discussion

28.	What is motion and rest.
Answer» What is motion and rest.

Discussion

29.	Explain why (a) a horse cannot pull a cart and run in empty space, (b) passengers are thrown forward from their seats when a speeding bus stops suddenly, (c) it is easier to pull a lawn mower than to push it, (d) a cricketer moves his hands backwards while holding a catch.
Answer» Explain why (a) a horse cannot pull a cart and run in empty space, (b) passengers are thrown forward from their seats when a speeding bus stops suddenly, (c) it is easier to pull a lawn mower than to push it, (d) a cricketer moves his hands backwards while holding a catch.

Discussion

30.	A circular loop of radius R carries current I2 in a clockwise direction, as shown in the figure. The centre of the loop is at a distance D above a long straight wire. What should be the magnitude and direction of the current I1 in the straight wire so that the net magnetic field at the centre of the loop is zero?
Answer» A circular loop of radius $R$ carries current $I_{2}$ in a clockwise direction, as shown in the figure. The centre of the loop is at a distance $D$ above a long straight wire. What should be the magnitude and direction of the current $I_{1}$ in the straight wire so that the net magnetic field at the centre of the loop is zero?

Discussion

31.	For an object projected from ground with speed u horizontal range of two times the maximum height attained by it. The horizontal range of object is
Answer» For an object projected from ground with speed u horizontal range of two times the maximum height attained by it. The horizontal range of object is

Discussion

32.	what are the quantities that are same if the trajectory of two objects is the identical ?
Answer» what are the quantities that are same if the trajectory of two objects is the identical ?

Discussion

33.	In the arrangement shown in figure mA=4.0 kg and mB=1.0 kg. The system is released from rest and block B is found to have a speed 0.3 m/s after it has descended through a distance of 1 m. Find the coefficient of friction between the block A and the table. Neglect friction elsewhere. (Take g=10 m/s2)
Answer» In the arrangement shown in figure $m_{A} = 4.0 kg$ and $m_{B} = 1.0 kg .$ The system is released from rest and block $B$ is found to have a speed $0.3 m/s$ after it has descended through a distance of $1 m$ . Find the coefficient of friction between the block $A$ and the table. Neglect friction elsewhere. (Take $g = 10 m / s^{2}$ )

Discussion

34.	Figure shows water filled in a symmetrical container. Four pistons of equal area A are used at the four openings to keep the water in equilibrium. Now an additional force F is applied at each piston. The increase in the pressure at the centre of the container due to this addition is
Answer» Figure shows water filled in a symmetrical container. Four pistons of equal area $A$ are used at the four openings to keep the water in equilibrium. Now an additional force $F$ is applied at each piston. The increase in the pressure at the centre of the container due to this addition is

Discussion

35.	10.A man weighs 80 N on the surface of Earth of radius R. At what height above the surface of the Earth his weight will be 40N
Answer» 10.A man weighs 80 N on the surface of Earth of radius R. At what height above the surface of the Earth his weight will be 40N

Discussion

36.	A torque of 20 Nm is applied to a flywheel of mass 10 kg and radius of gyration 50 cm. The resulting angular acceleration is
Answer» A torque of 20 Nm is applied to a flywheel of mass 10 kg and radius of gyration 50 cm. The resulting angular acceleration is

Discussion

37.	Sketch a graph which correctly represent variation of electric field E for a dipole at different points among the line connecting the two charges with procedure
Answer» Sketch a graph which correctly represent variation of electric field E for a dipole at different points among the line connecting the two charges with procedure

Discussion

38.	Two concentric shell R and 2R, charges qA and qB and potential 2V and 3V2 respectively. Now shell B is earthed and finally charges on shell A and B are qA and qB respectively. Then
Answer» Two concentric shell R and 2R, charges $q_{A}$ and $q_{B}$ and potential 2V and $\frac{3 V}{2}$ respectively. Now shell B is earthed and finally charges on shell A and B are $q_{A}$ and $q_{B}$ respectively. Then

Discussion

39.	A parallel plate capacitor has two layers of dielectrics as shown in figure. This capacitor is connected across a battery, then the ratio of potential difference across the dielectric layers from P to Q is
Answer» A parallel plate capacitor has two layers of dielectrics as shown in figure. This capacitor is connected across a battery, then the ratio of potential difference across the dielectric layers from P to Q is

Discussion

40.	A uniform ′T′ shaped object with dimensions as shown in the figure, is lying on a smooth floor. A force →F is applied at the point P parallel to limb AB, such that the object has only the translational motion without rotation. Find the distance of point P from C
Answer» A uniform $^{'} T^{'}$ shaped object with dimensions as shown in the figure, is lying on a smooth floor. A force $\to F$ is applied at the point P parallel to limb $A B$ , such that the object has only the translational motion without rotation. Find the distance of point $P$ from $C$

Discussion

41.	A stone of mass m is thrown at an angle of 60^° above the horizontal axis from the ground. Thekinetic energy of the stone at the highest point(If K is the kinetic energy of the stone at the timeof projection) will be
Answer» A stone of mass m is thrown at an angle of 60^° above the horizontal axis from the ground. Thekinetic energy of the stone at the highest point(If K is the kinetic energy of the stone at the timeof projection) will be

Discussion

42.	Four wires of identical length, diameters and of the same material are stretched on a sonometer wire. If the ratio of their tension is 1:4:9:16, then the ratio of their fundamental frequencies is
Answer» Four wires of identical length, diameters and of the same material are stretched on a sonometer wire. If the ratio of their tension is $1 : 4 : 9 : 16$ , then the ratio of their fundamental frequencies is

Discussion

43.	If the linear momentum is increased by 50%, then by what percentage will kinetic energy increase?
Answer» If the linear momentum is increased by 50%, then by what percentage will kinetic energy increase?

Discussion

44.	In a series RC circuit shown in the figure, at an instant, the applied voltage is 10 V and the voltage across the capacitor is found to be 8 V. The phase difference between the current and the applied voltage will be -
Answer» In a series RC circuit shown in the figure, at an instant, the applied voltage is $10 V$ and the voltage across the capacitor is found to be $8 V$ . The phase difference between the current and the applied voltage will be -

Discussion

45.	If A and B are acute angles such that sin A = cos B then (A + B) = ?(a) 30°(b) 45°(c) 60°(d) 90°
Answer» If A and B are acute angles such that sin A = cos B then (A + B) = ? (a) 30° (b) 45° (c) 60° (d) 90°

Discussion

46.	A filter transmits only the radition of wavelength greater than 440 nm. Radition from a hydrogen discharge tube goes through such a filter and is incident on a metal of work function 2.0 e V. Find the stopping potential which can stop the photoelectrons.
Answer» A filter transmits only the radition of wavelength greater than 440 nm. Radition from a hydrogen discharge tube goes through such a filter and is incident on a metal of work function 2.0 e V. Find the stopping potential which can stop the photoelectrons.

Discussion

47.	A very small current carrying circular loop of radius r is placed in y−z plane with centre at origin of coordinate systemThe magnetic field at P1 is
Answer» A very small current carrying circular loop of radius $r$ is placed in $y - z$ plane with centre at origin of coordinate system The magnetic field at $P_{1}$ is

Discussion

48.	A spherical conductor of radius 12 cm has a charge of 1.6 × 10–7C distributed uniformly on its surface. What is the electric field (a) inside the sphere (b) just outside the sphere (c) at a point 18 cm from the centre of the sphere?
Answer» A spherical conductor of radius 12 cm has a charge of 1.6 × 10–7C distributed uniformly on its surface. What is the electric field (a) inside the sphere (b) just outside the sphere (c) at a point 18 cm from the centre of the sphere?

Discussion

49.	why only angle of incidence is used in the angle of deviation
Answer» why only angle of incidence is used in the angle of deviation

Discussion

50.	Current I flows in an infinitely long straight wire with cross-section in the form of thin uniform semicircular ring of radius R as shown in the diagram. The magnetic field at the centre O will be -
Answer» Current $I$ flows in an infinitely long straight wire with cross-section in the form of thin uniform semicircular ring of radius $R$ as shown in the diagram. The magnetic field at the centre $O$ will be -

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

The edges of a parallelepiped are given by the vectors (3 ^i+3^j+6^k), 4^j and 8^j+m^k. What should be the value of m in order that the volume of the parallelepiped be 60?

The graph shows the behaviour of a length of wire in the region for which the substance obeys Hook's law. P and Q represent

Six forces, 9.81 N each, acting at a point are coplanar. If the angles between neighbouring forces are equal, then the resultant is

Why electron can't exist in nucleus of atom?

when the light frequency 2vo(where vo is threshold frequency) is incident on a metal plate, the maximum velocity of electrons emitted is v1. when the frequency of the incident radiation is increased to 5vo, the maximum velocity of electrons emitted fromthe same platev2. the ratio of v1 to v2

What will happen if two soap bubbles of different radii are connected by a tube?

Magnification of a compound microscope is 30. Focal length of eyepiece is 5 cm and the final image is formed at the least distance of distinct vision. Find the magnification of objective lens.

Three identical bodies each of mass M are placed at vertices of an equilateral triangle of arm L keeping the triangle as such by which speed bodies should be rotated in their gravitational fields so that the particle moves along the circumference of circular orbit

The period of a particle in SHM is 8 s. At t=0, it is at the mean position. The ratio of the distance travelled by it in the 1st and the 2nd second is

A projectile takes off with an initial velocity of 20 m/s at an angle of elevation of 45∘. It is just able to clear two hurdles of height 4 m each, separated from each other by a distance d. What is the value of d? (Take g=10 m/s2)

A horizontal platform is executing simple harmonic motion in the vertical direction of frequency v. A block of mass m is placed on the platform. What is the maximum amplitude of the platform so that the block is not detached from it ?

Water flows through a 60 cm diameter, 1 km long pipe from a 30 m head of over tank to a village. Ignore minor losses. Fanning friction factor =0.04. The discharge (cumec) at the village ground level is

A 5kg block is resting on a frictionless plane. It is struck by a jet, releasing water at the rate of 3kg/s emerging with a a speed of 4m/s. Calculate the initial acceleration of the block

A force F=(^i+4^j) N acts on the block shown. The force of friction acting on the block is :

a cell delivers equal power to load resistances R1 and R2 individually. the value of internal resistance of the cell is R1+R2 R1R2/R2+R2 R1R2 R1R2/2

out NO_{2 }and CO_{2_{}} which is more acidic and why

Two concentric spherical shells have masses M1 and M2 and radii R1 and R2 (R1&lt;R2). What is the force exerted by this system on a particle of mass m if it is at a distance (R1+R2)2 from the centre?

What do we mean when we say there is potential drop across that resistance in case of current .. and how it is different from concept of potential that is explained in electrostatic . Can i get an intuitive picture for that ..

What is the definition of approximation with respect to differentiation ?

Unpolarised light of intensity 32Wm−2 passes through three polarisers such that the transmission axis of the last polarizer is perpendicular to that of the first. At what angle will the transmitted intensity be maximum?

The length(in units) of vector 2→a+3→b, such that A=(1,1,−1) and B=(2,0,0)(where →a,→b are position vectors of −−→OA,−−→OB respectively)

Two point charges 2 μC and 8μC are placed 12 cm apart. The position of point from 2 μC charge, where the electric field intensity is zero is:

In hydrogen atom, the de-broglie wavelength of an electron in the 2nd bohr orbit is-? ( bohr radius=52.9pm)

calulate the field due to an electric dipole of length 10cm and consisting of charge of \pm100micro coulomb at apoint 20 cm from each charge .

What is motion and rest.

Explain why (a) a horse cannot pull a cart and run in empty space, (b) passengers are thrown forward from their seats when a speeding bus stops suddenly, (c) it is easier to pull a lawn mower than to push it, (d) a cricketer moves his hands backwards while holding a catch.

For an object projected from ground with speed u horizontal range of two times the maximum height attained by it. The horizontal range of object is

what are the quantities that are same if the trajectory of two objects is the identical ?

Figure shows water filled in a symmetrical container. Four pistons of equal area A are used at the four openings to keep the water in equilibrium. Now an additional force F is applied at each piston. The increase in the pressure at the centre of the container due to this addition is

10.A man weighs 80 N on the surface of Earth of radius R. At what height above the surface of the Earth his weight will be 40N

A torque of 20 Nm is applied to a flywheel of mass 10 kg and radius of gyration 50 cm. The resulting angular acceleration is

Sketch a graph which correctly represent variation of electric field E for a dipole at different points among the line connecting the two charges with procedure

Two concentric shell R and 2R, charges qA and qB and potential 2V and 3V2 respectively. Now shell B is earthed and finally charges on shell A and B are qA and qB respectively. Then

A parallel plate capacitor has two layers of dielectrics as shown in figure. This capacitor is connected across a battery, then the ratio of potential difference across the dielectric layers from P to Q is

A uniform ′T′ shaped object with dimensions as shown in the figure, is lying on a smooth floor. A force →F is applied at the point P parallel to limb AB, such that the object has only the translational motion without rotation. Find the distance of point P from C

A stone of mass m is thrown at an angle of 60^° above the horizontal axis from the ground. Thekinetic energy of the stone at the highest point(If K is the kinetic energy of the stone at the timeof projection) will be

Four wires of identical length, diameters and of the same material are stretched on a sonometer wire. If the ratio of their tension is 1:4:9:16, then the ratio of their fundamental frequencies is

If the linear momentum is increased by 50%, then by what percentage will kinetic energy increase?

In a series RC circuit shown in the figure, at an instant, the applied voltage is 10 V and the voltage across the capacitor is found to be 8 V. The phase difference between the current and the applied voltage will be -

If A and B are acute angles such that sin A = cos B then (A + B) = ?(a) 30°(b) 45°(c) 60°(d) 90°

A filter transmits only the radition of wavelength greater than 440 nm. Radition from a hydrogen discharge tube goes through such a filter and is incident on a metal of work function 2.0 e V. Find the stopping potential which can stop the photoelectrons.

A very small current carrying circular loop of radius r is placed in y−z plane with centre at origin of coordinate systemThe magnetic field at P1 is

A spherical conductor of radius 12 cm has a charge of 1.6 × 10–7C distributed uniformly on its surface. What is the electric field (a) inside the sphere (b) just outside the sphere (c) at a point 18 cm from the centre of the sphere?

why only angle of incidence is used in the angle of deviation

Current I flows in an infinitely long straight wire with cross-section in the form of thin uniform semicircular ring of radius R as shown in the diagram. The magnetic field at the centre O will be -

Two concentric spherical shells have masses M1 and M2 and radii R1 and R2 (R1<R2). What is the force exerted by this system on a particle of mass m if it is at a distance (R1+R2)2 from the centre?