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An air capacitor C connected to a batter...

An air capacitor C connected to a battery of e.m.f. V acquires a 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 ?

A

V and q decrease but C and E increase

B

V remains unchange, but q, E and C increase

C

q remains unchanged, C increases, V and E decrease

D

q and C increase but V and E decrease.

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Knowledge Check

  • While a capacitor remains connected to a battery and dielectric slab is applied between the plates, then

    A
    Potential difference between the plates is changed
    B
    Change flows from the battery to the capacitor
    C
    Electric field between the plates increases
    D
    Energy store in the capacitor decreases

  • A capacitor is kept connected to the battery and a dielectric slab is inserted between the plates. During this process

    A
    No work is done
    B
    Work is done at the cost of the energy already stored in the capacitor before the slab is inserted
    C
    Work is done at the cost of the battery
    D
    Work is done at the cost of both the capacitor and the battery

  • A parallel plate capacitor is charged by a battery after charging the capacitor, battery is disconnected and if a dielectric plate is inserted between the place of plates. Then which one of the following statements is not correct :

    A
    increase in the stored energy
    B
    decrease in the potential difference
    C
    decrease in the electric field
    D
    increase in the capacitance

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