JEE Main 2021 Physics question

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 :

• (A)0.4
• (B)0.8
• (C)0.125
• (D)0.2Correct