A coil of inductance 0.2 henry is connected to 600 volt battery. At what rate, will the current in the coil grow when circuit is completed ?

Q: A coil of inductance 0.2 henry is connected to 600 volt battery. At what rate, will the current in the coil grow when circuit is completed?

Sol: As the battery and inductor are in parallel, at any instead, emf of the battery and self emf in the inductor are equal

$\large |e| = L \frac{dI}{dt} $

$\large \frac{dI}{dt} = \frac{|e|}{L} = \frac{600}{0.2}$

= 3000 A/s