Let “I” be the current through the circuit and (di/dt) be the rate of change of current through the circuit at that instant.
∴ Instantaneous voltage across Inductor LV = L(di/dt)
Given Inductance = 8HRate of change of current di/dt = 0.5A
V = 8 × 0.5 = 4 V
Instantaneous voltage across Inductor V = 4 V