Figure shows the circuit that contains three resistances (9 Ω each) and two inductors (4 mH each). The reading of ammeter at the moment switch K is turned ON, i $s _________A.$

Question

Figure shows the circuit that contains three resistances (9 Ω each) and two inductors (4 mH each). The reading of ammeter at the moment switch K is turned ON, i s _________A.

G1 Physics · Accepted Answer

Immediately after the switch is closed, current through an inductor cannot change instantaneously. Since both inductors initially carry zero current, at t = 0⁺ each inductor behaves as an open circuit. Therefore the two branches containing inductors do not conduct at that instant. The only conducting branch between the top and bottom rails contains the single 9 Ω resistor. Thus, I = V/R = 9/9 = 1 A. Correct option: A.