Calculate the average induced emf?

You were right, but multiply by the number of turns N = 30 (a) average induced emf is V = N*A*dB/dt which can be approximated to V = N*A*B/t V = 30*(0.022m)^2 * 2.25T / 0.335s V = 0.0975V = 97.5 mV (b) average induced current in coil is I = V / R I = 0.0975V / 0.78 ohm = 0.125A = 125 mA.

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