The self-inductance of the coil is 10 mh. The magnetic flux through the cross section of the coil corresponding to current 2 ma is
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total flux=400x10x10^-3x2x19^-3=8x10^-3
Flux through cross section=8^10^-3/200=4x!0^-5
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Flux through cross section=8^10^-3/200=4x!0^-5
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