$(a)$ What is electromagnetic induction?
$(b)$ In what way can the magnitude of the induced current be increased?

(N/A) Electromagnetic induction is the phenomenon of producing an induced current in a coil when the magnetic field associated with it changes with time.
$(b)$ The magnitude of the induced current can be increased by:
$1$. Increasing the strength of the magnetic field.
$2$. Increasing the speed of movement of the conductor relative to the magnetic field.
$3$. Increasing the number of turns in the coil.