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Question

The capacitance of two concentric spherical shells of radii R1andR2(R2>R1) is:

A
4πε0R2
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B
4πε0R2R1R1R2
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C
4πε0R2R1R2R1
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D
4πε0R1
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Solution

The correct option is D 4πε0R2R1R2R1
Let K=14πϵo
Potential at outer spherical shell is V2=KQR2
Potential at inner spherical shell is V1=KQR1
Potential difference, V=V1V2=KQR1KQR2
Capacitance, C=QV=1K(1R11R2)
C=4πϵoR1R2R2R1

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