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Two coils of wire are placed close together. Initially, a current of 2.58 A exists in one of the coils, but there is no current in the other. The current is then switched off in a time of 2.52 x 10^-2s. During this time, the average emf induced in the other coil is 4.12 V. What is the mutual inductance of the two-coil system?

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