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Q.

The distance between the plates of a condenser is reduced to ¼ th and the space between the plates is filled up by a medium of dielectric constant K = 2.8. The capacity is increased to

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a

none

b

14 times

c

22 times

d

11.2

answer is A.

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Detailed Solution

C=Aε0d;C'=2.8Aε0d(4)⇒C'=2.8×4CC'=11.2C

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