An LR circuit containing a battery is switched on at t = 0 . Just after the connection is made, which of the following quantities is non-zero?

Step-by-step solution

At t = 0 , the current in the LR circuit is zero ( i = 0 ). Magnetic field energy in the inductor is U = 1 2 Li^2 = 0 . Power delivered by the battery is P = Ei = 0 . Current in the circuit is i = 0 . Applying Kirchhoff's voltage law, E - iR - L di dt = 0 . At t = 0 , since i = 0 , we get L di dt = E . The induced emf in the inductor is L di dt , which is equal to the battery's emf E and is non-zero.