Two coils, P and Q, are placed near each other. When the current in coil P changes at a rate of 5 A/s, an EMF of 0.02 V is induced in coil Q. The mutual inductance between the coils is:

As a magnet approaches a coil, flux rises steadily and a constant non-zero EMF is induced (Faraday's law). Once the magnet stops moving, flux stays constant and the induced EMF drops to zero - EMF only exists while flux is actively changing.