MCQs of Electrostatic Potential and Capacitance

Showing 1 to 10 out of 141 Questions
1.
For a uniform electric field , 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
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) (b) $\frac{\mathrm{Q}}{2{\mathrm{\xi }}_{0}r}$ (c) Zero (d) 2πQr
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
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
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
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
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) $\frac{3\mathrm{U}}{2}$ (b) U (c) $\frac{\mathrm{U}}{4}$ (d) $\frac{\mathrm{U}}{2}$
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
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
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
Showing 1 to 10 out of 141 Questions