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Question

in an oscillating L-C circuit , the maximum charge on the capacitor is Q. the charge on the capacitor , when the energy is stored equally between the electric and magnetic field is

1) Q/2

2) Q/(2)1/2

3) Q/(3)1/2

4) Q/3

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Solution

The electric energy stored when energy in equally distributed, U'E=12q2C
The energy stored in the capacitor when it is maximally charged, UE=12Q2C
Now
UE=2U'Eq=Q2
so 2 is the right answer.

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