Two coils of wire are placed close together. Initially, a currentof 2.5 A exists in one of the coils, but there is no currentin the other. The current is thenswitched off in a time of3.7 × 10−2 s. During thistime, the average emf induced in the other coil is 1.7 V. Whatis the mutual inductanceof the two-coil system?
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