JEE Mains 29-July-2022 Shift 1 Solved Paper

A coil of inductance 1H and resistance 100Ω is connected to a battery of 6V. Determine approximately :
(a) The time elapsed before the current acquires half of its steady - state value.
(b) The energy stored in the magnetic field associated with the coil at an instant 15‌ms after the circuit is switched on. (Given ln‌2=0.693,e−3∕2=0.25 )