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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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