A varying current at the rate of \( 3 \mathrm{~A} / \mathrm{s} \) in a coil generates an e.m.f. ...

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A varying current at the rate of \( 3 \mathrm{~A} / \mathrm{s} \) in a coil generates an e.m.f. of \( 8 \mathrm{mV} \) in a nearby coil. The mutual inductance of the two coils is
(A) \( 2.66 \mathrm{mH} \)
(B) \( 2.66 \mathrm{H} \)
(C) \( 2.66 \times 10^{-3} \mathrm{mH} \)
(D) \( 0.266 \mathrm{H} \)
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