A solenoid has an inductance of 60 H and a resistance of 30 . If it is connected to a 100 V battery, how long will it take for the current to reach e-1 e =63.2 % of its final value?

Step-by-step solution

Given, aligned & L=60 H & R=30 & V=100 ~V aligned In L-R circuit current to reach 63.2 % of its final value in time constant. Equation of current in L-R circuit I=I₀ (1-e^ -R t / L ) Required time = time constant = L R = 60 30 =2 ~s