A 20 Henry inductor coil is connected to a 10 ohm resistance in series as shown in figure. The time at which rate of dissipation of energy (Joule's heat) across resistance is equal to the rate at which magnetic energy is stored in the inductor, is :
For L-R circuit
where
and rate of magnetic energy stored in inductor =
and rate of dissipiation of energy across Resistance =
from question
So
Option 4)
Study 40% syllabus and score up to 100% marks in JEE