Question

The reactance of a coil when used in the domestic ac power supply (220 volts, 50 cycles per second) is 50 ohms. The inductance of the coil is nearly

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

Answer 1

Answer: (D)

0.16 henry

Answer 2

$X _ { L } = 2 \pi v L \Rightarrow L = \frac { X _ { L } } { 2 \pi v } = \frac { 50 } { 2 \times 3.14 \times 50 } = 0.16 \mathrm { H }$