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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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11.2

22 times

14 times

none

answer is A.

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Detailed Solution

$\begin{array}{l} C = \frac{{Aε}_{0}}{d}; C^{'} = \frac{2 .8 {Aε}_{0}}{d} (4) \Rightarrow C' = 2 .8 \times 4 C \\ C^{'} = 11 .2 C \end{array}$

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