50278 + Interview Questions in Physics

1.	The number of photons of wavelength 540 nm emitted per second by an electric bulb of power 100W is (taking h = h=6×10−34J−sec )
Answer» The number of photons of wavelength 540 nm emitted per second by an electric bulb of power 100W is (taking h = $h = 6 \times 10^{- 34} J - s e c$ )

Discussion

2.	A rod of length l and radius r is held between two rigid walls so that it is not allowed to expand. If its temperature is increased ,then the force developed in it is proportional to
Answer» A rod of length l and radius r is held between two rigid walls so that it is not allowed to expand. If its temperature is increased ,then the force developed in it is proportional to

Discussion

3.	An electron with (rest mass m0) moves with a speed of 0.8 c. Its mass when it moves with this speed is
Answer» An electron with (rest mass $m_{0}$ ) moves with a speed of $0.8 c .$ Its mass when it moves with this speed is

Discussion

4.	A parallel plate condenser initially has air as a medium between the plates. If a slab of dielectric constant 5 having thickness half the distance of separation between the plates is introduced, the percentage increase in its capacity will be ___
Answer» A parallel plate condenser initially has air as a medium between the plates. If a slab of dielectric constant 5 having thickness half the distance of separation between the plates is introduced, the percentage increase in its capacity will be ___

Discussion

5.	When a uniform metallic wire is stretched the lateral strain produced in it is β. if σ and Y are given then u =
Answer» When a uniform metallic wire is stretched the lateral strain produced in it is β. if σ and Y are given then u =

Discussion

6.	A simple pendulum whose bob has a mass m and charge q is placed in a horizontal electric field e find the angle which the string makes with the downward vertical line when the bob is in equilibrium??
Answer» A simple pendulum whose bob has a mass m and charge q is placed in a horizontal electric field e find the angle which the string makes with the downward vertical line when the bob is in equilibrium??

Discussion

7.	A farmer bought some sacks of animal feed. The weights of the sacks are given below in kilograms. What is the average weight of the sacks ?49.8, 49.7, 49.5, 49.3, 50, 48.9, 49.2, 48.8
Answer» A farmer bought some sacks of animal feed. The weights of the sacks are given below in kilograms. What is the average weight of the sacks ? 49.8, 49.7, 49.5, 49.3, 50, 48.9, 49.2, 48.8

Discussion

8.	difference between equal set and equivalent set
Answer» difference between equal set and equivalent set

Discussion

9.	Under the identical condition a gas CxHy diffuses two times slower than Helium. What is the value of (x+y) ?
Answer» Under the identical condition a gas CxHy diffuses two times slower than Helium. What is the value of (x+y) ?

Discussion

10.	119.does mass depend on speed?
Answer» 119.does mass depend on speed?

Discussion

11.	If y=3t2−4t, then minima of y will be at
Answer» If $y = 3 t^{2} - 4 t$ , then minima of $y$ will be at

Discussion

12.	Figure shows a smooth vertical circular track of radius R. A block slides along the surface AB when it is given a velocity equal to √6gR at point A. The ratio of the force exerted by the track on the block at point A to that at point B is
Answer» Figure shows a smooth vertical circular track of radius $R$ . A block slides along the surface $A B$ when it is given a velocity equal to $\sqrt{6 g R}$ at point $A$ . The ratio of the force exerted by the track on the block at point $A$ to that at point $B$ is

Discussion

13.	97.Each of 125 water drops of radius .9mm is at a potential of 10v .if they coalesce to form a bigger drop what will be the capacitance and potential?
Answer» 97.Each of 125 water drops of radius .9mm is at a potential of 10v .if they coalesce to form a bigger drop what will be the capacitance and potential?

Discussion

14.	The potential energy of a particle is determined by the expression U=α(x2+y2), where α is a positive constant. The particle begins to move from a point with the coordinates (3, 3) (m), only under the action of potential field force. Then its kinetic energy T at the instant when the particle is at a point with the coordinates (1, 1) (m) is
Answer» The potential energy of a particle is determined by the expression $U = α (x^{2} + y^{2})$ , where $α$ is a positive constant. The particle begins to move from a point with the coordinates (3, 3) (m), only under the action of potential field force. Then its kinetic energy T at the instant when the particle is at a point with the coordinates (1, 1) (m) is

Discussion

15.	A point charge +10 μC is a distance 5 cm directly above the centreof a square of side 10 cm, as shown in Fig. 1.34. What is themagnitude of the electric flux through the square? (Hint: Think ofthe square as one face of a cube with edge 10 cm.)
Answer» A point charge +10 μC is a distance 5 cm directly above the centreof a square of side 10 cm, as shown in Fig. 1.34. What is themagnitude of the electric flux through the square? (Hint: Think ofthe square as one face of a cube with edge 10 cm.)

Discussion

16.	A well of cross-sectional area aw is connected to an inclined tube of cross-sectional area at to form a differential pressuere gauge as shown in the figure below. When p1=p2 the common liquid level is denoted by A. When p1>p2, the liquid level in the well is depressed to B, and the level in the tube rises by l along its length such that deffirence in the tube well levels is hd.The angle of inclination θ of the tube with the horizontal is
Answer» A well of cross-sectional area $a_{w}$ is connected to an inclined tube of cross-sectional area $a_{t}$ to form a differential pressuere gauge as shown in the figure below. When $p_{1} = p_{2}$ the common liquid level is denoted by A. When $p_{1} > p_{2}$ , the liquid level in the well is depressed to B, and the level in the tube rises by l along its length such that deffirence in the tube well levels is $h_{d}$ . The angle of inclination $θ$ of the tube with the horizontal is

Discussion

17.	Give two reasons to justify that:An iron almirah is a solid.
Answer» Give two reasons to justify that: An iron almirah is a solid.

Discussion

18.	A wire of length l carries a current I along x-axis. A magnetic field exists which is given as →B=B0(^i+^j+^k) T. The magnitude of the magnetic force acting on the wire will be
Answer» A wire of length $l$ carries a current $I$ along $x-$ axis. A magnetic field exists which is given as $\to B = B_{0} (^i +^j +^k) T$ . The magnitude of the magnetic force acting on the wire will be

Discussion

19.	The intensity of light produced by a light source varies inversely as the square of the distance from the source. If the intensity of light produced 3 feet from a light source is 750 foot-candles, find the intensity of light produced 5 feet from the same source. [4 MARKS]
Answer» The intensity of light produced by a light source varies inversely as the square of the distance from the source. If the intensity of light produced 3 feet from a light source is 750 foot-candles, find the intensity of light produced 5 feet from the same source. [4 MARKS]

Discussion

20.	The boxes of masses 2 kg and 8 kg are connected by a massless string passing over smooth pulleys. Calculate the time taken by box of mass 8 kg to strike the ground starting from rest.(Use g=10 m/s2) :
Answer» The boxes of masses $2 kg$ and $8 kg$ are connected by a massless string passing over smooth pulleys. Calculate the time taken by box of mass $8 kg$ to strike the ground starting from rest. $(Use g = 10 {m/s}^{2})$ :

Discussion

21.	The net force on a body is varying with time as (2t + 3) N. Find the change in momentum of the body after 2 secs?
Answer» The net force on a body is varying with time as (2t + 3) N. Find the change in momentum of the body after 2 secs?

Discussion

22.	A spherical conductor is placed near another positively charged conductor. The net charge acquired by spherical conductor will be(1) Either positive or negative(2) Positive only(3) Negative only(4 Zero
Answer» A spherical conductor is placed near another positively charged conductor. The net charge acquired by spherical conductor will be(1) Either positive or negative(2) Positive only(3) Negative only(4 Zero

Discussion

23.	draw a x t graph in which velocity 1 is grater than velocity 2
Answer» draw a x t graph in which velocity 1 is grater than velocity 2

Discussion

24.	3. Two blocks of masses 8kg and 12kg are connected at the ends of a light inextensible string the string passes over a frictionless pulley. The acceleration of the system is
Answer» 3. Two blocks of masses 8kg and 12kg are connected at the ends of a light inextensible string the string passes over a frictionless pulley. The acceleration of the system is

Discussion

25.	the capacitance of a parallel plate capacitar with air medium 6uf with the introduction of capacitance become 30uf
Answer» the capacitance of a parallel plate capacitar with air medium 6uf with the introduction of capacitance become 30uf

Discussion

26.	The bob of a pendulum is released from a horizontal position. If the length of the pendulum is 1.5 m, what is the speed with which the bob arrives at the lowermost point, given that it dissipated 5% of its initial energy against air resistance?
Answer» The bob of a pendulum is released from a horizontal position. If the length of the pendulum is 1.5 m, what is the speed with which the bob arrives at the lowermost point, given that it dissipated 5% of its initial energy against air resistance?

Discussion

27.	A 60 kg man skating with a speed of 10 ms collides with a 40 kg skater at rest and they cling to each other.Find the loss of kinetic energy during the collision.
Answer» A 60 kg man skating with a speed of 10 $\frac{m}{s}$ collides with a 40 kg skater at rest and they cling to each other.Find the loss of kinetic energy during the collision.

Discussion

28.	When the mass of an electron becomes equal to thrice its rest mass, its speed is- (where c-is the speed of light)
Answer» When the mass of an electron becomes equal to thrice its rest mass, its speed is- (where $c$ -is the speed of light)

Discussion

29.	A man of mass 'M' having a bag of mass 'm' slips from the roof of a tall building of height 'H' and starts falling vertically (figure). When at a height 'h' from the ground, he notices that the ground below him is pretty hard, but there is a pond at a horizontal distance 'x' from the line of fall. In order to save himself he throws the bag horizontally (with respect to himself) in the direction opposite to the pond. Calculate the minimum horizontal velocity imparted to the bag so that the man lands in the water.
Answer» A man of mass 'M' having a bag of mass 'm' slips from the roof of a tall building of height 'H' and starts falling vertically (figure). When at a height 'h' from the ground, he notices that the ground below him is pretty hard, but there is a pond at a horizontal distance 'x' from the line of fall. In order to save himself he throws the bag horizontally (with respect to himself) in the direction opposite to the pond. Calculate the minimum horizontal velocity imparted to the bag so that the man lands in the water.

29.

A man of mass 'M' having a bag of mass 'm' slips from the roof of a tall building of height 'H' and starts falling vertically (figure). When at a height 'h' from the ground, he notices that the ground below him is pretty hard, but there is a pond at a horizontal distance 'x' from the line of fall. In order to save himself he throws the bag horizontally (with respect to himself) in the direction opposite to the pond. Calculate the minimum horizontal velocity imparted to the bag so that the man lands in the water.

Answer»

A man of mass 'M' having a bag of mass 'm' slips from the roof of a tall building of height 'H' and starts falling vertically (figure). When at a height 'h' from the ground, he notices that the ground below him is pretty hard, but there is a pond at a horizontal distance 'x' from the line of fall. In order to save himself he throws the bag horizontally (with respect to himself) in the direction opposite to the pond. Calculate the minimum horizontal velocity imparted to the bag so that the man lands in the water.

Discussion

30.	Three masses are placed on the x - axis. A mass of 300 gm is placed at the origin, 400 gm at x=40 cm and 500 gm at x=70 cm repectively. The distance of the centre of mass of the system from the origin will be:
Answer» Three masses are placed on the $x$ - axis. A mass of $300 gm$ is placed at the origin, $400 gm$ at $x = 40 cm$ and $500 gm$ at $x = 70 cm$ repectively. The distance of the centre of mass of the system from the origin will be:

Discussion

31.	40.What is the minimum coefficient of friction for a solid sphere to roll without slipping on an inclined plane of inclination θ ?
Answer» 40.What is the minimum coefficient of friction for a solid sphere to roll without slipping on an inclined plane of inclination θ ?

Discussion

32.	Calculate electric field intensity at a point on the axis which is at distance x from the center of half ring, having total charge Q distributed uniformly on it. The radius of half ring is R.
Answer» Calculate electric field intensity at a point on the axis which is at distance x from the center of half ring, having total charge Q distributed uniformly on it. The radius of half ring is R.

Discussion

33.	A particle starts from the origin at t = 0 s with a velocity of 10.0 j m/s and moves in the x-y plane with a constant acceleration of (8.0 iˆ + 2.0 jˆ ) m s¯². (a) At what time is the x- coordinate of the particle 16 m? What is the y-coordinate of the particle at that time? (b) What is the speed of the particle at the time ?
Answer» A particle starts from the origin at t = 0 s with a velocity of 10.0 j m/s and moves in the x-y plane with a constant acceleration of (8.0 iˆ + 2.0 jˆ ) m s¯². (a) At what time is the x- coordinate of the particle 16 m? What is the y-coordinate of the particle at that time? (b) What is the speed of the particle at the time ?

Discussion

34.	When the stretching force of a sonometer wire is increased by 2.5kg the frequency produced by it increases by 50% . Find the original stretching force.
Answer» When the stretching force of a sonometer wire is increased by 2.5kg the frequency produced by it increases by 50% . Find the original stretching force.

Discussion

35.	In a situation shown in figure, if the length of the minute's hand is 10π cm, find the magnitude of change in velocity of the tip of the minute's hand.
Answer» In a situation shown in figure, if the length of the minute's hand is $\frac{10}{π} cm$ , find the magnitude of change in velocity of the tip of the minute's hand.

Discussion

36.	Which of the following is/are correct regarding the distribution of speed of N2 and CO2 at the definite temperature ?
Answer» Which of the following is/are correct regarding the distribution of speed of $N_{2}$ and $C O_{2}$ at the definite temperature ?

Discussion

37.	What concentration of HCOO- is present in a solutuon of 0.02M HCOOH and 0.04 M HCLKa for HCOOH is 2.4×10^-4
Answer» What concentration of HCOO- is present in a solutuon of 0.02M HCOOH and 0.04 M HCL Ka for HCOOH is 2.4×10^-4

Discussion

38.	Ajet plane is travelling towards west at a speed of 1800 km/h. What isthe voltage difference developed between the ends of the wing havinga span of 25 m, if the Earth’s magnetic field at the locationhas a magnitude of 5 × 10−4T and the dip angle is 30°.
Answer» A jet plane is travelling towards west at a speed of 1800 km/h. What is the voltage difference developed between the ends of the wing having a span of 25 m, if the Earth’s magnetic field at the location has a magnitude of 5 × 10⁻⁴ T and the dip angle is 30°.

Discussion

39.	A uniform homogenous rope of mass ′m′ and length ′l′ is pulled by a force F on a smooth inclined plane of angle θ. Find the force on the rope at a distance x from the end where force is applied.
Answer» A uniform homogenous rope of mass $^{'} m^{'}$ and length $^{'} l^{'}$ is pulled by a force $F$ on a smooth inclined plane of angle $θ$ . Find the force on the rope at a distance $x$ from the end where force is applied.

Discussion

40.	ntTwo stones of masses m and 2 m are whirled in horizontal circles, the heavier one in a radius r/2 and lighter one in radius r. The tangential speed of lighter stone is n times that of the value of heavier stone when they experience same centripetal forces. The value of n is n ntn
Answer» ntTwo stones of masses m and 2 m are whirled in horizontal circles, the heavier one in a radius r/2 and lighter one in radius r. The tangential speed of lighter stone is n times that of the value of heavier stone when they experience same centripetal forces. The value of n is n ntn

Discussion

41.	A 12.5ev electron beam is used to bombard gaseous hdrogen at room temperature .What series of wavelengths will be emitted
Answer» A 12.5ev electron beam is used to bombard gaseous hdrogen at room temperature .What series of wavelengths will be emitted

Discussion

42.	A particle is moving with speed v=b√x along the positive x - axis. Calculate the speed of the particle at time t=τ. (Assume that the particle is at the origin at t=0).
Answer» A particle is moving with speed $v = b \sqrt{x}$ along the positive $x$ - axis. Calculate the speed of the particle at time $t = τ$ . (Assume that the particle is at the origin at $t = 0$ ).

Discussion

43.	Two identical glass (μg=32) equiconvex lenses of focal length f are kept in contact. The space between the two lenses is filled with water (μw=43) . The focal length of the combination is
Answer» Two identical glass $(μ_{g} = \frac{3}{2})$ equiconvex lenses of focal length f are kept in contact. The space between the two lenses is filled with water $(μ_{w} = \frac{4}{3})$ . The focal length of the combination is

Discussion

44.	Which of the following is the unit vector perpendicular to →A and →B?
Answer» Which of the following is the unit vector perpendicular to $\to A and \to B$ ?

Discussion

45.	A mass M attached to a horizontal spring, executes SHM with amplitude A1 on a smooth horizontal surface. When the mass M passes through its mean position, then a small mass m is placed over it and both of them move together with amplitude A2. The ratio of (A1A2) will be
Answer» A mass $M$ attached to a horizontal spring, executes SHM with amplitude $A_{1}$ on a smooth horizontal surface. When the mass $M$ passes through its mean position, then a small mass $m$ is placed over it and both of them move together with amplitude $A_{2}$ . The ratio of $(\frac{A_{1}}{A_{2}})$ will be

Discussion

46.	Equation of alternating current is given by I= 10√2sin(100πt+π/6). The time taken by current to reach the root mean square value from t=0 is t'. Then the value of t' is ?
Answer» Equation of alternating current is given by I= 10√2sin(100πt+π/6). The time taken by current to reach the root mean square value from t=0 is t'. Then the value of t' is ?

Discussion

47.	A particle of mass m is executing oscillation about the origin on the x axis. It's potential energy is U=K\|x\|^3 where k is positive constant. If the amplitude of oscillation is a, then it's time period T is
Answer» A particle of mass m is executing oscillation about the origin on the x axis. It's potential energy is U=K\|x\|^3 where k is positive constant. If the amplitude of oscillation is a, then it's time period T is

Discussion

48.	if the momentum of an object increased by 10% then k.e will increase by
Answer» if the momentum of an object increased by 10% then k.e will increase by

Discussion

49.	47.A microscope is focusssed on an ink mark on the top of a table.If we place a glass slab of 3 cm thick on it,how should be the microscope be moved to focus the ink spot again?The refractive index of the glass is1.5
Answer» 47.A microscope is focusssed on an ink mark on the top of a table.If we place a glass slab of 3 cm thick on it,how should be the microscope be moved to focus the ink spot again?The refractive index of the glass is1.5

Discussion

50.	36. A student measures the terminal potentialdifference (V) of a cell (of emf ε and internalresistance r) as a function of the current (I) flowingthrough it. The slope, and intercept, of the graphbetween V and I, then respectively, equal :(1)-e and r(3)-r and ε (2) ε and-r(4) r and-t
Answer» 36. A student measures the terminal potentialdifference (V) of a cell (of emf ε and internalresistance r) as a function of the current (I) flowingthrough it. The slope, and intercept, of the graphbetween V and I, then respectively, equal :(1)-e and r(3)-r and ε (2) ε and-r(4) r and-t

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

The number of photons of wavelength 540 nm emitted per second by an electric bulb of power 100W is (taking h = h=6×10−34J−sec )

A rod of length l and radius r is held between two rigid walls so that it is not allowed to expand. If its temperature is increased ,then the force developed in it is proportional to

An electron with (rest mass m0) moves with a speed of 0.8 c. Its mass when it moves with this speed is

A parallel plate condenser initially has air as a medium between the plates. If a slab of dielectric constant 5 having thickness half the distance of separation between the plates is introduced, the percentage increase in its capacity will be ___

When a uniform metallic wire is stretched the lateral strain produced in it is β. if σ and Y are given then u =

A simple pendulum whose bob has a mass m and charge q is placed in a horizontal electric field e find the angle which the string makes with the downward vertical line when the bob is in equilibrium??

A farmer bought some sacks of animal feed. The weights of the sacks are given below in kilograms. What is the average weight of the sacks ?49.8, 49.7, 49.5, 49.3, 50, 48.9, 49.2, 48.8

difference between equal set and equivalent set

Under the identical condition a gas CxHy diffuses two times slower than Helium. What is the value of (x+y) ?

119.does mass depend on speed?

If y=3t2−4t, then minima of y will be at

Figure shows a smooth vertical circular track of radius R. A block slides along the surface AB when it is given a velocity equal to √6gR at point A. The ratio of the force exerted by the track on the block at point A to that at point B is

97.Each of 125 water drops of radius .9mm is at a potential of 10v .if they coalesce to form a bigger drop what will be the capacitance and potential?

A point charge +10 μC is a distance 5 cm directly above the centreof a square of side 10 cm, as shown in Fig. 1.34. What is themagnitude of the electric flux through the square? (Hint: Think ofthe square as one face of a cube with edge 10 cm.)

Give two reasons to justify that:An iron almirah is a solid.

A wire of length l carries a current I along x-axis. A magnetic field exists which is given as →B=B0(^i+^j+^k) T. The magnitude of the magnetic force acting on the wire will be

The intensity of light produced by a light source varies inversely as the square of the distance from the source. If the intensity of light produced 3 feet from a light source is 750 foot-candles, find the intensity of light produced 5 feet from the same source. [4 MARKS]

The boxes of masses 2 kg and 8 kg are connected by a massless string passing over smooth pulleys. Calculate the time taken by box of mass 8 kg to strike the ground starting from rest.(Use g=10 m/s2) :

The net force on a body is varying with time as (2t + 3) N. Find the change in momentum of the body after 2 secs?

A spherical conductor is placed near another positively charged conductor. The net charge acquired by spherical conductor will be(1) Either positive or negative(2) Positive only(3) Negative only(4 Zero

draw a x t graph in which velocity 1 is grater than velocity 2

3. Two blocks of masses 8kg and 12kg are connected at the ends of a light inextensible string the string passes over a frictionless pulley. The acceleration of the system is

the capacitance of a parallel plate capacitar with air medium 6uf with the introduction of capacitance become 30uf

The bob of a pendulum is released from a horizontal position. If the length of the pendulum is 1.5 m, what is the speed with which the bob arrives at the lowermost point, given that it dissipated 5% of its initial energy against air resistance?

A 60 kg man skating with a speed of 10 ms collides with a 40 kg skater at rest and they cling to each other.Find the loss of kinetic energy during the collision.

When the mass of an electron becomes equal to thrice its rest mass, its speed is- (where c-is the speed of light)

Three masses are placed on the x - axis. A mass of 300 gm is placed at the origin, 400 gm at x=40 cm and 500 gm at x=70 cm repectively. The distance of the centre of mass of the system from the origin will be:

40.What is the minimum coefficient of friction for a solid sphere to roll without slipping on an inclined plane of inclination θ ?

Calculate electric field intensity at a point on the axis which is at distance x from the center of half ring, having total charge Q distributed uniformly on it. The radius of half ring is R.

When the stretching force of a sonometer wire is increased by 2.5kg the frequency produced by it increases by 50% . Find the original stretching force.

In a situation shown in figure, if the length of the minute's hand is 10π cm, find the magnitude of change in velocity of the tip of the minute's hand.

Which of the following is/are correct regarding the distribution of speed of N2 and CO2 at the definite temperature ?

What concentration of HCOO- is present in a solutuon of 0.02M HCOOH and 0.04 M HCLKa for HCOOH is 2.4×10^-4

Ajet plane is travelling towards west at a speed of 1800 km/h. What isthe voltage difference developed between the ends of the wing havinga span of 25 m, if the Earth’s magnetic field at the locationhas a magnitude of 5 × 10−4T and the dip angle is 30°.

A uniform homogenous rope of mass ′m′ and length ′l′ is pulled by a force F on a smooth inclined plane of angle θ. Find the force on the rope at a distance x from the end where force is applied.

ntTwo stones of masses m and 2 m are whirled in horizontal circles, the heavier one in a radius r/2 and lighter one in radius r. The tangential speed of lighter stone is n times that of the value of heavier stone when they experience same centripetal forces. The value of n is n ntn

A 12.5ev electron beam is used to bombard gaseous hdrogen at room temperature .What series of wavelengths will be emitted

A particle is moving with speed v=b√x along the positive x - axis. Calculate the speed of the particle at time t=τ. (Assume that the particle is at the origin at t=0).

Two identical glass (μg=32) equiconvex lenses of focal length f are kept in contact. The space between the two lenses is filled with water (μw=43) . The focal length of the combination is

Which of the following is the unit vector perpendicular to →A and →B?

A mass M attached to a horizontal spring, executes SHM with amplitude A1 on a smooth horizontal surface. When the mass M passes through its mean position, then a small mass m is placed over it and both of them move together with amplitude A2. The ratio of (A1A2) will be

Equation of alternating current is given by I= 10√2sin(100πt+π/6). The time taken by current to reach the root mean square value from t=0 is t'. Then the value of t' is ?

A particle of mass m is executing oscillation about the origin on the x axis. It's potential energy is U=K|x|^3 where k is positive constant. If the amplitude of oscillation is a, then it's time period T is

if the momentum of an object increased by 10% then k.e will increase by

47.A microscope is focusssed on an ink mark on the top of a table.If we place a glass slab of 3 cm thick on it,how should be the microscope be moved to focus the ink spot again?The refractive index of the glass is1.5

36. A student measures the terminal potentialdifference (V) of a cell (of emf ε and internalresistance r) as a function of the current (I) flowingthrough it. The slope, and intercept, of the graphbetween V and I, then respectively, equal :(1)-e and r(3)-r and ε (2) ε and-r(4) r and-t