Two coils of N1 and N2 turns are wound on a common core. If the current in coil 1 changes at 1 A/sec and it induces an emf of 1 V in coil 2, the magnitude of mutual inductance is:
1
1 henry
2
\(\frac{N_2}{N_1}\) henry
3
\(\frac{N_1}{N_2}\) henry
4
N1N2 henry
5
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