How Emf Induced by Changing the Magnetic Induction?

Emf induced by changing the magnetic induction

The magnetic induction can be changed by moving a magnet either towards or away from a coil and thus an induced emf is produced in the coil.

The magnetic induction can also be changed in one coil by changing the current in the neighbouring coil thus producing an induced emf.

∴ e = – NA cos θ (dB/dt)