JEE Main 2022 — Alternating Current Question with Solution

A coil of inductance 1 H and resistance $$100\Omega$$ is connected to a battery of 6 V. 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 15 ms after the circuit is switched on. (Given $$\ln 2=0.693,{\mathrm{e}}^{-3/2}=0.25$$)