50278 + Interview Questions in Physics

1.	The equivalent resistance between points A and B is
Answer» The equivalent resistance between points $A$ and $B$ is

Discussion

2.	The graph shows variation of stopping potential V0 versus frequency of incident radiation v for two photosensitive metals A and B. Which of the two metals has higher threshold frequency and why?
Answer» The graph shows variation of stopping potential $V_{0}$ versus frequency of incident radiation v for two photosensitive metals A and B. Which of the two metals has higher threshold frequency and why?

Discussion

3.	A wooden block is dropped from the top of a cliff 100 metre high and simultaneously a bullet of mass 10 gram is fired from the foot of the cliff upwards with a velocity of 100 m/s . The bullet and wooden block will meet each other after a time
Answer» A wooden block is dropped from the top of a cliff 100 metre high and simultaneously a bullet of mass 10 gram is fired from the foot of the cliff upwards with a velocity of 100 m/s . The bullet and wooden block will meet each other after a time

Discussion

4.	The reduction factor of a tangent galvanometer may be defined as the current passing through it to produce a deflection of
Answer» The reduction factor of a tangent galvanometer may be defined as the current passing through it to produce a deflection of

Discussion

5.	A closed pipe has length 0.6m. The air inside the pipe is maintained at temperature 27∘ C. Calculate the fundamental frequency and the frequency of the next two overtones. (given velocity of sound in air at 0∘C=330 ms−1)
Answer» A closed pipe has length 0.6m. The air inside the pipe is maintained at temperature $27^{\circ} C$ . Calculate the fundamental frequency and the frequency of the next two overtones. (given velocity of sound in air at $0^{\circ} C = 330 m s^{- 1}$ )

Discussion

6.	A body constrained to move along the z-axis of a coordinate system is subject to a constant force F given by F = −ˆi + 2 ˆj + 3 kˆ N where ˆi, ˆj, kˆ are unit vectors along the x-, y- and z-axis of the system respectively. What is the work done by this force in moving the body a distance of 4 m along the z-axis ?
Answer» A body constrained to move along the z-axis of a coordinate system is subject to a constant force F given by F = −ˆi + 2 ˆj + 3 kˆ N where ˆi, ˆj, kˆ are unit vectors along the x-, y- and z-axis of the system respectively. What is the work done by this force in moving the body a distance of 4 m along the z-axis ?

Discussion

7.	A resistance of 20 Ω is connected to a 40 V battery. Calculate the heat energy in joules generated per minute.
Answer» A resistance of $20 Ω$ is connected to a 40 V battery. Calculate the heat energy in joules generated per minute.

Discussion

8.	A particle of mass m is attached to one end of a weightless and inextensible string of length L. The particle is on a smooth horizontal table. The string passes through a hole in the table and to its other end is attached a small particle of equal mass m. The system is set in motion with the first particle describing a circle on the table with constant angular velocity ω1 and the second particle moving in the horizontal circle as a conical pendulum with constant angular velocity ω2. Then ω22:ω21=[Take r1=1 m, L=3 m]
Answer» A particle of mass $m$ is attached to one end of a weightless and inextensible string of length $L$ . The particle is on a smooth horizontal table. The string passes through a hole in the table and to its other end is attached a small particle of equal mass $m$ . The system is set in motion with the first particle describing a circle on the table with constant angular velocity $ω_{1}$ and the second particle moving in the horizontal circle as a conical pendulum with constant angular velocity $ω_{2}$ . Then $ω_{2}^{2} : ω_{1}^{2} =$ [Take $r_{1} = 1 m, L = 3 m$ ]

Discussion

9.	For a given thermodynamic process, the P - V diagram is as shown below: Which of the following is the V - T diagram for the process?
Answer» For a given thermodynamic process, the P - V diagram is as shown below: Which of the following is the V - T diagram for the process?

9.

For a given thermodynamic process, the P - V diagram is as shown below: Which of the following is the V - T diagram for the process?

Answer»

For a given thermodynamic process, the P - V diagram is as shown below: Which of the following is the V - T diagram for the process?

Discussion

10.	A particlr moves along the curve x2/9+y2/4=1with cons†an t speed v.Express its velocity vectorially as a functionof(x,y
Answer» A particlr moves along the curve x2/9+y2/4=1with cons†an t speed v.Express its velocity vectorially as a functionof(x,y

Discussion

11.	Six particles situated at the corners of a regular hexagonof side a move at a constant speed v. Each particlemaintains a direction towards the particle at the nextcorner. Calculate the time the particles will take to meeteach other.
Answer» Six particles situated at the corners of a regular hexagonof side a move at a constant speed v. Each particlemaintains a direction towards the particle at the nextcorner. Calculate the time the particles will take to meeteach other.

Discussion

12.	A rod of mass m and length l is kept near a point mass m which is at a distance of a from the center of the rod as shown in the figure. Find the potential energy due to the rod at point mass.
Answer» A rod of mass $m$ and length $l$ is kept near a point mass $m$ which is at a distance of $a$ from the center of the rod as shown in the figure. Find the potential energy due to the rod at point mass.

Discussion

13.	Must there necessarily be any mass at the centre of mass of the system? Give examples.
Answer» Must there necessarily be any mass at the centre of mass of the system? Give examples.

Discussion

14.	Two charges of magnitude 10 units and 20 units are separated by a certain distance. Now, both the charges are brought in contact and again separated to initial separation. What will be the ratio of initial and final electrostatic force?
Answer» Two charges of magnitude 10 units and 20 units are separated by a certain distance. Now, both the charges are brought in contact and again separated to initial separation. What will be the ratio of initial and final electrostatic force?

Discussion

15.	the energy of electron in Nth bohr orbital of hydrogen ato
Answer» the energy of electron in Nth bohr orbital of hydrogen ato

Discussion

16.	In a sinusoidal wave, the time required for a particle to move from maximum displacement to mean position is 0.17 s. The frequency of the wave is
Answer» In a sinusoidal wave, the time required for a particle to move from maximum displacement to mean position is $0.17 s$ . The frequency of the wave is

Discussion

17.	In the given circuit , the diodes D1 and D2 are ideal. If C1 = 5 pF and C2 = 10 pF then value of voltage VC2 will be _____V.0
Answer» In the given circuit , the diodes $D_{1}$ and $D_{2}$ are ideal. If $C_{1}$ = 5 pF and $C_{2}$ = 10 pF then value of voltage $V_{C_{2}}$ will be _____V. 0

Discussion

18.	A rod of weight 50 N is supported by two parallelknife edges P and Q and is in equilibrium in ahorizontal position. The knives are at a distance10 cm from each other. The centre of mass of therod is at distance 3 cm from P. The normal reactionon P is(1) 50 NN 00 (z)(3) 35 N(4) 20 N
Answer» A rod of weight 50 N is supported by two parallelknife edges P and Q and is in equilibrium in ahorizontal position. The knives are at a distance10 cm from each other. The centre of mass of therod is at distance 3 cm from P. The normal reactionon P is(1) 50 NN 00 (z)(3) 35 N(4) 20 N

Discussion

19.	A wedge of mass M fitted with a spring of spring constant k is kept on a smooth horizontal surface. A rod of mass m is kept on the wedge as shown in figure. The system is in equilibrium and at rest. Assuming that all surfaces are smooth, the potential energy stored in the spring is.
Answer» A wedge of mass $M$ fitted with a spring of spring constant $k$ is kept on a smooth horizontal surface. A rod of mass $m$ is kept on the wedge as shown in figure. The system is in equilibrium and at rest. Assuming that all surfaces are smooth, the potential energy stored in the spring is.

Discussion

20.	A ball collides directly with another ball at rest and is itself brought to rest by the impact. If one fourth of initial kinetic energy is destroyed in the collision, the coefficient of restitution of the collision is
Answer» A ball collides directly with another ball at rest and is itself brought to rest by the impact. If one fourth of initial kinetic energy is destroyed in the collision, the coefficient of restitution of the collision is

Discussion

21.	{x/X2 -5x-6=0,xN
Answer» {x/X2 -5x-6=0,xN

Discussion

22.	The magnetic force between wires, as shown in figure is
Answer» The magnetic force between wires, as shown in figure is

Discussion

23.	A ball is thrown vertically upwards with a velocity of 49m/s. Calculate, 1. The maximum height to which it rises.2. The total time to return to surface of the earth
Answer» A ball is thrown vertically upwards with a velocity of 49m/s. Calculate, 1. The maximum height to which it rises. 2. The total time to return to surface of the earth

Discussion

24.	in a single slit diffraction pattern red light of wavelength= 650nm is used and first minimum is found to lie at angle 15 the slit width 'a' is
Answer» in a single slit diffraction pattern red light of wavelength= 650nm is used and first minimum is found to lie at angle 15 the slit width 'a' is

Discussion

25.	Find the equivalent resistance between points M and N in the circuit shown in figure.
Answer» Find the equivalent resistance between points $M$ and $N$ in the circuit shown in figure.

Discussion

26.	What is london and dipole forces
Answer» What is london and dipole forces

Discussion

27.	a small ball is thrown with initial speed u at an angle theta from a smooth horizontal surface . the ball makes several impacts with the surface. the coefficient of restitution is is ethe horizontal displacement of ball between 4th and 5th impact will be
Answer» a small ball is thrown with initial speed u at an angle theta from a smooth horizontal surface . the ball makes several impacts with the surface. the coefficient of restitution is is e the horizontal displacement of ball between 4th and 5th impact will be

Discussion

28.	A particle is moving in a circular path of radius 50 cm with an uniform speed, completing one revolution in 10 s. The magnitude of centripetal acceleration of the particle is
Answer» A particle is moving in a circular path of radius $50 c m$ with an uniform speed, completing one revolution in $10 s$ . The magnitude of centripetal acceleration of the particle is

Discussion

29.	A horizontal rod is hit at one end. What kind of wave propagates in the rod if(i) the hit is made vertically(ii) the hit is made horizontally?
Answer» A horizontal rod is hit at one end. What kind of wave propagates in the rod if (i) the hit is made vertically (ii) the hit is made horizontally?

29.

A horizontal rod is hit at one end. What kind of wave propagates in the rod if(i) the hit is made vertically(ii) the hit is made horizontally?

Answer»

A horizontal rod is hit at one end. What kind of wave propagates in the rod if

(i) the hit is made vertically

(ii) the hit is made horizontally?

Discussion

30.	An electromagnetic wave is represented by the electric field →E=E0^n sin[ωt+(6y−8z)] Taking unit vectors in x y and z directions to be ^i,^j,^k, the direction of propogation ^s is given by:
Answer» An electromagnetic wave is represented by the electric field $\to E = E_{0}^n sin [ω t + (6 y - 8 z)]$ Taking unit vectors in $x y$ and $z$ directions to be $^i,^j,^k$ , the direction of propogation $^s$ is given by:

Discussion

31.	If a∫π2sinxdx=12, then a=?
Answer» If $a \int \frac{π}{2} sin x d x = \frac{1}{2}$ , then $a = ?$

Discussion

32.	You have 2 pipes of length 1.20 m. One pipe is open, other has one end closed. First overtone is formed in both the pipes. Find the position of 1st displacement node from origin
Answer» You have 2 pipes of length 1.20 m. One pipe is open, other has one end closed. First overtone is formed in both the pipes. Find the position of 1^st displacement node from origin

32.

You have 2 pipes of length 1.20 m. One pipe is open, other has one end closed. First overtone is formed in both the pipes. Find the position of 1st displacement node from origin

Answer»

You have 2 pipes of length 1.20 m. One pipe is open, other has one end closed. First overtone is formed in both the pipes. Find the position of 1^st displacement node from origin

Discussion

33.	A 2m long light metal rod AB is suspended from the ceiling horizontally by means of two vertical wires of equal length tied to its ends. One wire is of brass and has cross section of 0.2×10−4m2 and the other is of steel with 0.1×10−4m2 cross section. In order to have equal stress in the two wires, a weight is hang from the rod. The position of the weight along the rod from end A should be.
Answer» A 2m long light metal rod AB is suspended from the ceiling horizontally by means of two vertical wires of equal length tied to its ends. One wire is of brass and has cross section of $0.2 \times 10^{- 4} m^{2}$ and the other is of steel with $0.1 \times 10^{- 4} m^{2}$ cross section. In order to have equal stress in the two wires, a weight is hang from the rod. The position of the weight along the rod from end A should be.

33.

A 2m long light metal rod AB is suspended from the ceiling horizontally by means of two vertical wires of equal length tied to its ends. One wire is of brass and has cross section of 0.2×10−4m2 and the other is of steel with 0.1×10−4m2 cross section. In order to have equal stress in the two wires, a weight is hang from the rod. The position of the weight along the rod from end A should be.

Answer»

A 2m long light metal rod AB is suspended from the ceiling horizontally by means of two vertical wires of equal length tied to its ends. One wire is of brass and has cross section of $0.2 \times 10^{- 4} m^{2}$ and the other is of steel with $0.1 \times 10^{- 4} m^{2}$ cross section. In order to have equal stress in the two wires, a weight is hang from the rod. The position of the weight along the rod from end A should be.

Discussion

34.	A simple harmonic motion of a spring-block system has an amplitude A & time period T. Consider x=0 for equilibrium position. The time required by the block to travel from x=A to x=A2 is -
Answer» A simple harmonic motion of a spring-block system has an amplitude A & time period T. Consider x=0 for equilibrium position. The time required by the block to travel from $x = A t o x = \frac{A}{2}$ is -

Discussion

35.	Two rods, one of length L and the other of length 2L are made of the same material and have the same diameter. The two ends of the longer rod are maintained at 100∘C. One end of the shorter rod is maintained at 100∘C while the other end is insulated. Both the rods are exposed to the same environment at 40∘C. The temp at the insulated end of the shorter rod is measured to be 55∘C. The temp at the midpoint of the longer rod would be.
Answer» Two rods, one of length $L$ and the other of length $2 L$ are made of the same material and have the same diameter. The two ends of the longer rod are maintained at $100^{\circ} C .$ One end of the shorter rod is maintained at $100^{\circ} C$ while the other end is insulated. Both the rods are exposed to the same environment at $40^{\circ} C .$ The temp at the insulated end of the shorter rod is measured to be $55^{\circ} C .$ The temp at the midpoint of the longer rod would be.

Discussion

36.	A body is projected vertically upward direction from the surface of the earth. If upward direction is taken as positive then what will be the acceleration of the body during upward and downward journey ? Explain
Answer» A body is projected vertically upward direction from the surface of the earth. If upward direction is taken as positive then what will be the acceleration of the body during upward and downward journey ? Explain

Discussion

37.	Question 3Boojho’s uncle has set up an electroplating factory near his village. He should dispose off the waste of the factory.(a) in the nearby river.(b) in the nearby pond.(c) in the nearby cornfield.(d) according to the disposal guidelines of the local authority.
Answer» Question 3 Boojho’s uncle has set up an electroplating factory near his village. He should dispose off the waste of the factory. (a) in the nearby river. (b) in the nearby pond. (c) in the nearby cornfield. (d) according to the disposal guidelines of the local authority.

Discussion

38.	What is the difference between Acceleration and Velocity?
Answer» What is the difference between Acceleration and Velocity?

Discussion

39.	18 36 ML OF PURE WATER TAKE 100 SEC TO EVAPORATE FROM VESSEL AND HEATER CONNECTED TO AN ELECTRIC SOURCE DELIVER 806 WATT HEAT OF VAPOURISATION OF WATER IS
Answer» 18 36 ML OF PURE WATER TAKE 100 SEC TO EVAPORATE FROM VESSEL AND HEATER CONNECTED TO AN ELECTRIC SOURCE DELIVER 806 WATT HEAT OF VAPOURISATION OF WATER IS

Discussion

40.	Find the height by which the sphere rises when the wedge is moved to touch the wall. The distance between the wedge and the wall is 10 m and the wedge is moved to the left until it touches the wall.
Answer» Find the height by which the sphere rises when the wedge is moved to touch the wall. The distance between the wedge and the wall is $10 m$ and the wedge is moved to the left until it touches the wall.

Discussion

41.	A river 5 km wide is flowing at the rate of 2 km/hr. The minimum time taken by a boat to cross the river with a speed 5 km/hr (in still water) is approximately
Answer» A river $5 km$ wide is flowing at the rate of $2 km/hr$ . The minimum time taken by a boat to cross the river with a speed $5 km/hr$ (in still water) is approximately

Discussion

42.	if a constant couple of 500 Nm turns a wheel of moment of inertia 100 kg m square about an axis through its centre the angular velocity gained is?
Answer» if a constant couple of 500 Nm turns a wheel of moment of inertia 100 kg m square about an axis through its centre the angular velocity gained is?

Discussion

43.	What is carnot theorem?
Answer» What is carnot theorem?

Discussion

44.	What is the % of electronic charge on more and less electronegative atom in Diatomic compound A-B. If the dipole moment of this compound is 1.6 Debye and It's internuclear distance is 100 pm.
Answer» What is the % of electronic charge on more and less electronegative atom in Diatomic compound A-B. If the dipole moment of this compound is 1.6 Debye and It's internuclear distance is 100 pm.

Discussion

45.	A particle is moving in a circle of radius R with constant speed v, if radius is double then its centripetal force to keep the same speed should be
Answer» A particle is moving in a circle of radius R with constant speed v, if radius is double then its centripetal force to keep the same speed should be

Discussion

46.	A horizontal F is applied on a spherical shell of radius R at distance R/2 above center as shown in figure. Shell is doing pure rolling motion and friction acting on it is f=xFy then, y-x is
Answer» A horizontal F is applied on a spherical shell of radius R at distance R/2 above center as shown in figure. Shell is doing pure rolling motion and friction acting on it is $f = \frac{x F}{y}$ then, y-x is

Discussion

47.	Find the current through the resistance R in figure if R=12 Ω.
Answer» Find the current through the resistance $R$ in figure if $R = 12 Ω$ .

Discussion

48.	In what ratio by mass of SO3 to CO should be mixed so that their partial pressure becomes equal? Options:a- 40:7 b-7:40 c-7:20 d- 20:7
Answer» In what ratio by mass of SO3 to CO should be mixed so that their partial pressure becomes equal? Options:a- 40:7 b-7:40 c-7:20 d- 20:7

Discussion

49.	Find the angle between →A=3^i+4^j and →B=12^i+5^j.
Answer» Find the angle between $\to A = 3^i + 4^j$ and $\to B = 12^i + 5^j$ .

Discussion

50.	3. Consider a uniform charge distribution with charge { density 2C/m^3 throughout in space. If a Gaussian sphere { has a variable radius which changes at the rate of 2m/s{ then value of rate of charge of flux is proportional to r_k{(r= radius of sphere). Then, find the value of k .
Answer» 3. Consider a uniform charge distribution with charge { density 2C/m^3 throughout in space. If a Gaussian sphere { has a variable radius which changes at the rate of 2m/s{ then value of rate of charge of flux is proportional to r_k{(r= radius of sphere). Then, find the value of k .

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

The equivalent resistance between points A and B is

The graph shows variation of stopping potential V0 versus frequency of incident radiation v for two photosensitive metals A and B. Which of the two metals has higher threshold frequency and why?

A wooden block is dropped from the top of a cliff 100 metre high and simultaneously a bullet of mass 10 gram is fired from the foot of the cliff upwards with a velocity of 100 m/s . The bullet and wooden block will meet each other after a time

The reduction factor of a tangent galvanometer may be defined as the current passing through it to produce a deflection of

A closed pipe has length 0.6m. The air inside the pipe is maintained at temperature 27∘ C. Calculate the fundamental frequency and the frequency of the next two overtones. (given velocity of sound in air at 0∘C=330 ms−1)

A resistance of 20 Ω is connected to a 40 V battery. Calculate the heat energy in joules generated per minute.

For a given thermodynamic process, the P - V diagram is as shown below: Which of the following is the V - T diagram for the process?

A particlr moves along the curve x2/9+y2/4=1with cons†an t speed v.Express its velocity vectorially as a functionof(x,y

Six particles situated at the corners of a regular hexagonof side a move at a constant speed v. Each particlemaintains a direction towards the particle at the nextcorner. Calculate the time the particles will take to meeteach other.

A rod of mass m and length l is kept near a point mass m which is at a distance of a from the center of the rod as shown in the figure. Find the potential energy due to the rod at point mass.

Must there necessarily be any mass at the centre of mass of the system? Give examples.

Two charges of magnitude 10 units and 20 units are separated by a certain distance. Now, both the charges are brought in contact and again separated to initial separation. What will be the ratio of initial and final electrostatic force?

the energy of electron in Nth bohr orbital of hydrogen ato

In a sinusoidal wave, the time required for a particle to move from maximum displacement to mean position is 0.17 s. The frequency of the wave is

In the given circuit , the diodes D1 and D2 are ideal. If C1 = 5 pF and C2 = 10 pF then value of voltage VC2 will be _____V.0

A rod of weight 50 N is supported by two parallelknife edges P and Q and is in equilibrium in ahorizontal position. The knives are at a distance10 cm from each other. The centre of mass of therod is at distance 3 cm from P. The normal reactionon P is(1) 50 NN 00 (z)(3) 35 N(4) 20 N

A wedge of mass M fitted with a spring of spring constant k is kept on a smooth horizontal surface. A rod of mass m is kept on the wedge as shown in figure. The system is in equilibrium and at rest. Assuming that all surfaces are smooth, the potential energy stored in the spring is.

A ball collides directly with another ball at rest and is itself brought to rest by the impact. If one fourth of initial kinetic energy is destroyed in the collision, the coefficient of restitution of the collision is

{x/X2 -5x-6=0,xN

The magnetic force between wires, as shown in figure is

A ball is thrown vertically upwards with a velocity of 49m/s. Calculate, 1. The maximum height to which it rises.2. The total time to return to surface of the earth

in a single slit diffraction pattern red light of wavelength= 650nm is used and first minimum is found to lie at angle 15 the slit width 'a' is

Find the equivalent resistance between points M and N in the circuit shown in figure.

What is london and dipole forces

a small ball is thrown with initial speed u at an angle theta from a smooth horizontal surface . the ball makes several impacts with the surface. the coefficient of restitution is is ethe horizontal displacement of ball between 4th and 5th impact will be

A particle is moving in a circular path of radius 50 cm with an uniform speed, completing one revolution in 10 s. The magnitude of centripetal acceleration of the particle is

A horizontal rod is hit at one end. What kind of wave propagates in the rod if(i) the hit is made vertically(ii) the hit is made horizontally?

An electromagnetic wave is represented by the electric field →E=E0^n sin[ωt+(6y−8z)] Taking unit vectors in x y and z directions to be ^i,^j,^k, the direction of propogation ^s is given by:

If a∫π2sinxdx=12, then a=?

You have 2 pipes of length 1.20 m. One pipe is open, other has one end closed. First overtone is formed in both the pipes. Find the position of 1st displacement node from origin

A simple harmonic motion of a spring-block system has an amplitude A &amp; time period T. Consider x=0 for equilibrium position. The time required by the block to travel from x=A to x=A2 is -

A body is projected vertically upward direction from the surface of the earth. If upward direction is taken as positive then what will be the acceleration of the body during upward and downward journey ? Explain

Question 3Boojho’s uncle has set up an electroplating factory near his village. He should dispose off the waste of the factory.(a) in the nearby river.(b) in the nearby pond.(c) in the nearby cornfield.(d) according to the disposal guidelines of the local authority.

What is the difference between Acceleration and Velocity?

18 36 ML OF PURE WATER TAKE 100 SEC TO EVAPORATE FROM VESSEL AND HEATER CONNECTED TO AN ELECTRIC SOURCE DELIVER 806 WATT HEAT OF VAPOURISATION OF WATER IS

Find the height by which the sphere rises when the wedge is moved to touch the wall. The distance between the wedge and the wall is 10 m and the wedge is moved to the left until it touches the wall.

A river 5 km wide is flowing at the rate of 2 km/hr. The minimum time taken by a boat to cross the river with a speed 5 km/hr (in still water) is approximately

if a constant couple of 500 Nm turns a wheel of moment of inertia 100 kg m square about an axis through its centre the angular velocity gained is?

What is carnot theorem?

What is the % of electronic charge on more and less electronegative atom in Diatomic compound A-B. If the dipole moment of this compound is 1.6 Debye and It's internuclear distance is 100 pm.

A particle is moving in a circle of radius R with constant speed v, if radius is double then its centripetal force to keep the same speed should be

A horizontal F is applied on a spherical shell of radius R at distance R/2 above center as shown in figure. Shell is doing pure rolling motion and friction acting on it is f=xFy then, y-x is

Find the current through the resistance R in figure if R=12 Ω.

In what ratio by mass of SO3 to CO should be mixed so that their partial pressure becomes equal? Options:a- 40:7 b-7:40 c-7:20 d- 20:7

Find the angle between →A=3^i+4^j and →B=12^i+5^j.

3. Consider a uniform charge distribution with charge { density 2C/m^3 throughout in space. If a Gaussian sphere { has a variable radius which changes at the rate of 2m/s{ then value of rate of charge of flux is proportional to r_k{(r= radius of sphere). Then, find the value of k .

A simple harmonic motion of a spring-block system has an amplitude A & time period T. Consider x=0 for equilibrium position. The time required by the block to travel from x=A to x=A2 is -