Bhautik Study

Q. An inductor coil stores 64 J of magnetic field energy and dissipates energy at the rate of 640 W when a current of 8A is passed through it. If this coil is joined across an ideal battery, find the time constant of the circuit in seconds :

(1) 0.4

(2) 0.8

(3) 0.125

(4) 0.2                                                                         (JEE-2021)