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Q.

The energy stored in a sphere of 10cm radius when the sphere is charged to a potential of 300 volt is

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a

3 × 10–6J

b

5 × 10–7J

c

4 × 10–7J

d

2 × 10–6J

answer is A.

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Detailed Solution

U=12CV2=124πε0rV2=1219X109×0.13002=5×10−7J

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The energy stored in a sphere of 10cm radius when the sphere is charged to a potential of 300 volt is