The rate of change of current in coil 1 is di1dt=3mA/s. Hence, there's a change of magnetic flux in coil 2, which induces an emf in coil 2 by Faraday's law. The magnitude of the emf induced in coil 2 is E2=11V. The number of turns in coil 2 is N2=43. a) Find the magnitude of the rate of change of flux dϕ/dt. b)  Find the mutual inductance M21.

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