Question

describe an activity with diagram to show that current is induced in a coil when magnetic field around it is changed

Answer 1

faraday discorved that when mf is changed around a coil a v is induced in it.let e take a solenide with insulated cu wiring on it when we bring magnet near the solenoid voltage is induced in one direction when we change polarity they induced in other direction this is due to flux change
induced voltage=change in flux with respect to time

Answer 2

Electro magnetic induction is a process to generate electricity by changing the magnetic field

You can draw this as follows