Question

The reactance of coil when used in an A.C. power supply ( 220volts, 50 cycles/sec) is 50ohms. The inductance of the coil is nearly

• A. 0.16 H
• B. 0.22 H
• C. 2.2 H
• D. 1.6 H

Answer 1

The correct option is A 0.16 H

Given : $f=50$ cycles/sec
Reactance $X_L=50\Omega$
Inductance of the coil $L=\frac{X_L}{w}=\frac{50}{2\pi f}=\frac{50}{2\pi \times 50}=0.16H$