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Question

The plates of a parallel plate capacitor are charged upto 100V.A 2mm thick insulator shunt is inserted between the plates . Then to maintain the same potential difference ,the distance between the same potential difference , the distance between the capacitor plates is increased by 1.6mm.The dielectric constant of the insulator is

A
5
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B
8
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C
4
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D
6
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Solution

The correct option is A 5
Here,V=100V and t=2mm
As V=qc and V and q remain unchanged ,
therefore C must be constant
ie, Ci=Cf
ε0Ad=ε0Ad+1.6t+tk
1.6t+tk=0
As t=2mm,therefore
1.62+2k=0
or 2k=0.4
k=20.4=5

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