The reactance of a coil is 157 Ω. On connecting the coil across a source of frequency 100 Hz, the current lags behind the emf by 45°. The inductance of the coil is
A. 0.25 H
B. 0.5 H
C. 4 H
D. 314 H.
Answer:A
The reactance of a coil is 157 Ω. On connecting the coil across a source of frequency 100 Hz, the current lags behind the emf by 45°. The inductance of the coil is
A. 0.25 H B. 0.5 H C. 4 H D. 314 H.