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Question

Two concentric shells of radii 1 cm and 2 cm are charged to 3V and 5V, respectively. The charge on the inner shell is


A

49×1011C

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B

49×1011C

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C

29×1011C

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D

29×1011C

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Solution

The correct option is A

49×1011C


KQ1102+KQ12×102=3V

2Q1+Q2=23×1011 (i)

KQ12×102+KQ22×102=5V

Q1+Q2=109×1011 (ii)

From (i) and (ii)

Q1=49×1011C


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