A, B and C are three points in a uniform electric field. The electric potential is

maximum at B
maximum at C
same at all the three points A, B and C
maximum at A

Solution

Potential at B, V_B is maximum V_B > V_C > V_A

A parallel plate condenser has a uniform electric field E(V/m) in the space between the plates. If the distance between the plates is d(m) and area of each plate is A(m²) the energy(joules) stored in the condenser is

E²Ad/∈₀
¹⁄₂∈₀E²
∈₀EAd
¹⁄₂∈₀E²Ad

Solution

Two parallel metal plates having charges + Q and – Q faceeach other at a certain distance between them. If the plates are now dipped in kerosene oil tank, the electric field between the plates will

remain same
become zero
increases
decrease

Solution

Electric field E = ^σ⁄_ε = ^Q⁄_Aε

ε of kerosine oil is more than that of air.

As ε increases, E decreases.

An air capacitor C connected to a battery of e.m.f. V acquiresa charge q and energy E. The capacitor is disconnected from the battery and a dielectric slab is placed between the plates. Which of the following statements is correct ?

V and q decrease but C and E increase
V remains un change, but q, E and C increase
q remains unchanged, C increases, V and E decrease
q and C increase but V and E decrease

Solution

When a battery across the plates of capacitor is disconnected and dielectric slab is placed in between the plates, then

(i) capacity C increases
(ii) charge q remains unchanged
(iii) potential V decreases
(iv) energy E decreases

If a capacitor 900 µF is charged to 100 V and its total energy is transferred to a capacitor of capacitance 100 µF then its potential is

200 V
30 V
300 V
400 V

Solution

UnAttempted

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