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Q.

There is an air filled 1 pF parallel plate capacitor. When the plate separation is doubled and the space is filled with wax, the capacitance increases to 2 pF. The dielectric constant of wax is

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a

2

b

4

c

6

d

8

answer is B.

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Detailed Solution

Here, $C = \frac{ε_{0} A}{d} and C^{'} = \frac{{Kε}_{0} A}{2 d}$
$∴ \frac{C^{'}}{C} = \frac{K}{2} or \frac{2}{1} = \frac{K}{2} or K = 4$

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There is an air filled 1 pF parallel plate capacitor. When the plate separation is doubled and the space is filled with wax, the capacitance increases to 2 pF. The dielectric constant of wax is