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Q.

If the charge on a body is increased by an amount of 2 C, the energy stored in it increases by 21%. The original charge on the body.

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a

1 C

b

10 C

c

20 C

d

15 C

answer is C.

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Detailed Solution

U=q22c⇒αq2⇒qαUq1q2=U1U2⇒QQ+2=100121=1011⇒Q=20C

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If the charge on a body is increased by an amount of 2 C, the energy stored in it increases by 21%. The original charge on the body.