What will be the voltage (in V) across an 8H inductor, when the rate of change of current flowing through it is 0.5A/sec

• A. 8
• B. 2
• C. 6
• D. 4

Answer: (D)

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