Given, resistance, R=2Ω, Inductance, L=2mH, emf, E=9V and i be the current. ∵ At t=0 when switch is closed, inductors behave as open circuit. ∴ Effective circuit will be
By using Ohm's law, V=iReq ⇒i=V∕Req where, Req is equivalent resistance of series resistors, i.e., Req=R+R=2R=2×2=4Ω i=