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Question

If a thin metal foil of same area is placed between the two plates of a parallel plate capacitor of capacitance C, then new capacitance will be :

A
C
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B
2C
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C
3C
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D
4C
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Solution

The correct option is A C

We have

C=ε0Ad

After placement of plate of equal area in between two plates we have two capacitors in series.

Value of each capacitor

C1=ε0Ad/2

C1=2ε0Ad=2C

Equivalent capacitance

Ceq=2C×2C2C+2C

Ceq=C


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