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Question

If we increase 'd' of a parallel condenser to '2d' and fill wax to the whole empty space between its two plate, then capacitance increase from 1pF to 2pF. What is the dielectric constant of wax?

A
2
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B
4
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C
6
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D
8
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Solution

The correct option is C 4
Initially the capacitance, C1=Aϵ0d where A= area of plates
Final capacitance, C2=AKϵ02d where K= dielectric constant.
C1C2=2K12=2K
K=4

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