Question

At t=0, the current flowing in a 0.5H inductance is 80A. What constant voltage must be applied to reduce the current to 0 at t=0.8s?

A) 50 V
B) 100 V
C) 150 V
D) 200 V

Answer 1

The constant voltage that must be applied to reduce the current to 0 at t=0.8s is 50V. Hence the correct answer is option (A).

Step-by-step explanation:

To calculate the constant voltage that must be applied to reduce the current to 0 at t=0.8s, we can use the formula:

V = L * (di/dt)

Where V is the voltage, L is the inductance, and (di/dt) is the rate of change of current. In this case, L = 0.5H and (di/dt) = -80A/0.8s = -100A/s.

Plugging in these values, we get:

V = 0.5H * (-100A/s) = -50V/s = 50V

Therefore, the constant voltage that must be applied is 50V. The correct answer is (A) 50V.