A voltage source (V) is connected across an inductor (L) through a switch a form a circuit. At the instant the switch is closed
1
The current-I, in the circuit is constant & di/dt = zero
2
The current-I, in the current is zero & di/dt = zero
3
The current-I, in the circuit is zero & di/dt = V/L.
4
The current-I, in the circuit is constant & di/dt = V/L.