A 20 Henry inductor and coil is connected to a 10 ohm resistance in series as shown in figure. The time at which rated of dissipation of energy (Joule’* heat) across resistance is equal to the rate at which magnetic energy is stored in the inductor, is -
(1) 1/2 ln2
(2) ln 2
(3) 2ln 2
(4) 2/ln2
