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Question

# Charges Q,2Q and âˆ’Q are given to three concentric conducting spherical shells A,B and C respectively as shown in figure. The ratio of charges on the inner and outer surfaces of shell C will be :

A
+34
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B
34
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C
32
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D
32
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Solution

## The correct option is D −32The total charge inside of each shell is zero. According to this the charges will be distributed among surfaces of shells as shown in figure.From figure, the charge on inner surface of outer shell =−3Qand the charge on outer surface of outer shell =−Q+3Q=2QThe required ratio =−3Q2Q=−32

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