NEET Physics Electrostatic Potential and Capacitance MCQs

a)

b)

c)

d)

Answer:

Question: A positively charged particle is released from rest in an uniform electric field. The electric potential energy of the charge

a) decreases because the charge moves along the electric field

b) increases because the charge moves along the electric field

c) remains a constant because the electric field is uniform

d) decreases because the charge moves opposite to the electric field

Answer: decreases because the charge moves along the electric field

Question: Figure shows some equipotential lines distributed in space. A charged object is moved from point A to point B.

a) The work done is the same in Fig. (i), Fig.(ii) and Fig. (iii)

b) The work done in Fig. (iii) is greater than Fig. (ii) but equal to that in

c) The work done in Fig. (ii) is least

d) The work done in Fig. (i) is the greatest

Answer: The work done is the same in Fig. (i), Fig.(ii) and Fig. (iii)

Question: The electrostatic potential on the surface of a charged conducting sphere is 100V. Two statements are made in this regard S₁ at any point inside the sphere, electric intensity is zero. S₂ at any point inside the sphere, the electrostatic potential is 100V. Which of the following is a correct statement?

a) S₁ is true, S₂ is also true and S₁ is the cause of S₂

b) None of these

c) Both S₁ and S₂ are false

d) S₁ is true but S₂ is false

Answer: S₁ is true, S₂ is also true and S₁ is the cause of S₂

Question: Equipotentials at a great distance from a collection of charges whose total sum is not zero are approximately

a) spheres

b) planes

c) paraboloids

d) ellipsoids

Answer: spheres

Question:

a)

b)

c)

d)

Answer:

Question: In a region, the potential is represented by V(x, y, z) = 6x – 8xy – 8y + 6yz, where V is in volts and x, y, z are in metres. The electric force experienced by a charge of 2 coulomb situated at point (1, 1, 1) is :

a)

b)

c) 30 N

d) 24 N

Answer:

Question:

a) –80 J/C

b) 80 J/C

c) –120 J/C

d) None of these

Answer: –80 J/C

Question:  If potential (in volts) in a region is expressed as V(x, y, z) = 6 xy – y + 2yz, the electric field (in N/C) at point (1, 1, 0) is

a)

b)

c)

d)

Answer:

Question: The four capacitors, each of 25 m F are connected as shown in fig. The dc voltmeter reads 200 V. The charge on each plate of capacitor is

a)

b)

c)

d)

Answer:

More Questions...............................................

Question:

a)

b)

c)

d)

Answer:

Question:  At the corners of an equilateral triangle of side a (1 metre), three point charges are placed (each of 0.1 C). If this system is supplied energy at the rate of 1 kw, then calculate the time required to move one of the mid-point of the line joining the other two.

a) 50 h

b) 60 h

c) 48 h

d) 54 h

Answer: 50 h

Question:

a) 80%

b) 75%

c) 20%

d) 0%

Answer: 80%

Question:

a) 420 N/C

b) 480 N/C

c) 240 N/C

d) 360 N/C

Answer: 420 N/C

Question:  A parallel plate capacitor of area ‘A’ plate separation ‘d’ is filled with two dielectrics as shown. What is the capacitance of the arrangement ?

a)

b)

c)

d)

Answer:

Question: The diagrams below show regions of equipotentials

a) In all the four cases the work done is the same

b) Minimum work is required to move q in figure (i)

c) Maximum work is required to move q in figure (ii)

d) Maximum work is required to move q in figure (iii)

Answer: In all the four cases the work done is the same

Question: A capacitor is charged by a battery. The battery is removed and another identical uncharged capacitor is connected in parallel. The total electrostatic energy of resulting system

a) decreases by a factor of 2

b) remains the same

c) increases by a factor of 2

d) increases by a factor of 4

Answer: decreases by a factor of 2

Question: Two spherical conductors A and B of radii a and b (b>a) are placed concentrically in air. The two are connected by a copper wire as shown in figure. Then the equivalent capacitance of the system is

a)

b)

c)

d)

Answer:

Question:Assertion : Electric potential and electric potential energy are different quantities.
Reason : For a system of positive test charge and point charge electric potential energy = electric potential.

a) Assertion is correct, reason is incorrect

b) Assertion is incorrect, reason is correct

c) Assertion is correct, reason is correct; reason is not a correct explanation for assertion

d) Assertion is correct, reason is correct; reason is a correct explanation for assertion.

Answer: Assertion is correct, reason is incorrect

Question:

a) 32

b) 24

c) 2

d) 16

Answer: 32

Question: A long, hollow conducting cylinder is kept coaxially inside another long, hollow conducting cylinder of larger radius. Both the cylinders are initially electrically neutral

a) A potential difference appears between the two cylinders when a charge density is given to the inner cylinder

b) No potential difference appears between the two cylinders when a uniform line charge is kept along the axis of the cylinders

c) A potential difference appears between two cylinders when a charge density is given to the outer cylinder

d) None of these

Answer: A potential difference appears between the two cylinders when a charge density is given to the inner cylinder

Question: Two conducting shells of radius a and b are connected by conducting wire as shown in figure. The capacity of system is :

a) infinite

b) zero

c)

d)

Answer: infinite

Question: The electrostatic force between the metal plates of an isolated parallel plate capacitor C having a charge Q and area A, is

a) independent of the distance between the plates

b) linearly proportional to the distance between the plates

c) inversely proportional to the distance between the plates

d) proportional to the square root of the distance between the plates

Answer: independent of the distance between the plates

Question:Assertion : For a non-uniformly charged thin circular ring with net charge is zero, the electric field at any point on axis of the ring is zero.
Reason : For a non-uniformly charged thin circular ring with net charge zero, the electric potential at each point on axis of the ring is zero

a) Assertion is incorrect, reason is correct

b) Assertion is correct, reason is incorrect

c) Assertion is correct, reason is correct; reason is not a correct explanation for assertion

d) Assertion is correct, reason is correct; reason is a correct explanation for assertion

Answer: Assertion is incorrect, reason is correct

Question:

a)

b)

c)

d)

Answer:

Question:

a) 1.2 n C

b) 0.3 n C

c) 2.4 n C

d) None of these

Answer: 1.2 n C

Question:

a) 7

b)

c)

d)

Answer: 7

Question:

a)

b)

c)

d)

Answer:

Question:

a) 8 × 10^–6 N

b) 4 × 10^–6 N

c) 2 × 10^–6 N

d) 6 × 10^–6 N

Answer: 8 × 10^–6 N

Question: The electric potential at point A is 1V and at another point B is 5V. A charge 3 μC is released from B. What will be the kinetic energy of the charge as it passes through A ?

a) 12 × 10^–6 J

b) 4 × 10^–6 J

c) 8 × 10^–6 J

d) 12 × 10^–9 J

Answer: 12 × 10^–6 J

Question: A square of side ‘a’ has charge Q at its centre and charge ‘q’ at one of the corners. The work required to be done in moving the charge ‘q’ from the corner to the diagonally opposite corner is

a) zero

b)

c)

d)

Answer:  zero

Question:

a)

b)

c)

d)

Answer:

Question:

a)

b)

c)

d)

Answer:

Question:

a) 2 × 10⁶ V/s

b) 2 × 10⁴ V/s

c) 4 × 10⁶ V/s

d) 4 × 10⁴ V/s

Answer: 2 × 10⁶ V/s

Question:  A parallel plate condenser is immersed in an oil of dielectric constant 2. The field between the plates is

a)

b)

c)

d) None of these

Answer:

Question:

a)

b)

c)

d)

Answer:

Question:

a) 6

b) 8/3

c) 3

d) 12

Answer: 6

Question:  A parallel plate capacitor is made of two circular plates separated by a distance 5 mm and with a dielectric of dialectric constant 2.2 between them. When the electric field in the dielectric is 3 × 10⁴ V/m the charge density of the positive plate will be close to:

a)

b)

c)

d)

Answer:

Question:

a) 8kV

b) 10kV

c) 6kV

d) 4kV

Answer: 8kV

Question:  A, B, C, D, E, F are conducting plates each of area A and any two consecutive plates separated by a distance d. The net energy stored in the system after the switch S is closed is

a)

b)

c)

d)

Answer:

Question:

a)

b)

c)

d)

Answer:

Question:

a) 120 J

b) – 120 J

c) – 240 J

d) zero

Answer: 120 J

Question:  There is a uniform electrostatic field in a region. The potential at various points on a small sphere centred at P, in the region, is found to vary between in the limits 589.0 V to 589.8 V. What is the potential at a point on the sphere whose radius vector makes an angle of 60° with the direction of the field ?

a) 589.4 V

b) 589.6 V

c) 589.2 V

d) 589.5 V

Answer: 589.4 V

Question:

a)

b)

c)

d) None of these

Answer:

Question:

a)

b)

c)

d)

Answer: