Electrostatic Potential and Capacitance  MCQs

MCQs of Electrostatic Potential and Capacitance

Showing 1 to 10 out of 141 Questions
1.
For a uniform electric field E = E0(i^), if the electric potential at x = 0 is zero, then the value of electric potential at x = +x will be _____
(a) xE0
(b) -xE0
(c) x2E0
(d) -x2E0
Answer:

Option (b)

2.
The line integral of an electric field along the circumference of a circle or radius r, drawn with a point charge Q at the centre will be _____
(a) 14πξ0 Qr
(b) Q2ξ0r
(c) Zero
(d) 2πQr
Answer:

Option (c)

3.
A particle having mass 1 g and electric charge 10-8C travels from a point A having electric potential 600 V to the point B having zero potential. What would be the change in its kinetic energy ?
(a) -6 x 10-6 erg
(b) -6 x 10-6 J
(c) 6 x 10-6 J
(d) 6 x 10-6 erg
Answer:

Option (c)

4.
A particle having mass m and charge q is at rest. On applying a uniform electric field E on it, it starts moving. What is its kinetic energy when it travels a distance y in the direction of force ?
(a) qE2y
(b) qEy2
(c) qEy
(d) q2Ey
Answer:

Option (c)

5.
The electric potential of 5 V is on the surface of hollow metal sphere of radius 3 cm. What will be electric potential at the centre of sphere ?
(a) 0 V
(b) 3 V
(c) 5 V
(d) 10 V
Answer:

Option (c)

6.
A moving electron approaches another electron. What would be the charge in the potential energy of this system ?
(a) Remains constant
(b) Increases
(c) Decreases
(d) May increase or decrease
Answer:

Option (b)

7.
Energy of charged capacitor is U. Now it is removed from a battery and then is connected to another identical uncharged capacitor in parallel. What will be the energy of each capacitor now ?
(a) 3U2
(b) U
(c) U4
(d) U2
Answer:

Option (c)

8.
A uniform electric field is prevailing in Y-direction in a certain region. The co-ordinates of points A, B and C are (0, 0), (2, 0) and (0, 2) respectively. Which of the following alternatives is true for the potential of these points ?
(a) VA = VB, VA > VC
(b) VA > VB, VA = VC
(c) VA < VC, VB = VC
(d) VA = VB, VA < VC
Answer:

Option (a)

9.
The capacitance of a parallel plate capacitor formed by the circular plates of diameter 4.0 cm is equal to the capacitance of a sphere of diameter 200 cm. Find the distance between two plates.
(a) 2 x 10-4 m
(b) 1 x 10-4
(c) 3 x 10-4
(d) 4 x 10-4
Answer:

Option (b)

10.
The capacitance of a variable capacitor joined with a battery of 100 V is changed from 2μF to 10μF. What is the change in the energy stored in it?
(a) 2 x 10-2 J
(b) 2.5 x 10-2 J
(c) 6.5 x 10-2 J
(d) 4 x 10-2 J
Answer:

Option (d)

Showing 1 to 10 out of 141 Questions