The reactance of a coil is `157 Omega`. On connecting the coil across a source of frequency 100 Hz, the current lags behind the e.m.f. by `45^(@)`. Wh
The reactance of a coil is `157 Omega`. On connecting the coil across a source of frequency 100 Hz, the current lags behind the e.m.f. by `45^(@)`. What is the inductance of the coil?
A. 0.25 H
B. 0.5 H
C. 4 H
D. 314 H
5 views
1 Answers
Correct Answer - A
`X_(L) = omegaL = 2 pi f L`
`:. L = (X_L)/(2 pi f) = (157)/( 2 xx 314) = 1/4`
`:. L = 0.25 H`.
5 views
Answered