A coil of inductance  `L = 300  mH` and resitance `R = 140 m Omega`  is connected
Channel: Doubtnut
Date: 23/08/2020

A coil of inductance  `L = 300  mH` and resitance `R = 140 m Omega`  is connected  to a constant  voltage  source. How  soon will  the coil current reach `eta = 50 %`  of the  steady-state value ?