When current in a coil changes from 5 A to 2 A in 0.1 s, an average voltage of 50 V is produced

• Magnetism

When current in a coil changes from 5 A to 2 A in 0.1 s, an average voltage of 50 V is produced. The self-inductance of the coil is:

1. 0.67 H
2. 1.67 H
3. 3 H
4. 6 H

Solution

EMF = L × di/dt

50 = L × (5-2)/0.1 = L × 30

L = 5/3 = 1.67 

The correct option is B.