Two coils are at fixed locations. When coil 1 has no current and the current in coil 2 increases...

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Two coils are at fixed locations. When coil 1 has no current and the current in coil 2 increases at the rate \( 21.0 \mathrm{~A} / \mathrm{s} \), the emf in coil 1 is \( 25.0 \mathrm{mV} \). (a) What is their mutual inductance? (b) When coil 2 has no current and coil 1 has a current of \( 1.35 \mathrm{~A} \), what is the flux linkage in coil \( 2 ? \)
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