Figure shows the circuit that contains three resistances (\(9\,\Omega\) each) and two inductors (\(4\,\text{mH}\) each). The reading of ammeter at the moment switch \(K\) is turned ON, is _________ A.
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An inductor behaves like an open circuit at the instant a DC supply is switched ON.
To determine the reading of the ammeter at the moment the switch \(K\) is turned ON, we need to understand the behavior of inductors in a circuit at the instant they are energized.
When the switch \(K\) is first closed, inductors behave like open circuits because the current cannot change instantaneously in an inductor. Thus, the initial current through the inductors is zero.
Given that both inductors behave as open circuits at the very moment the switch is closed, no current can flow through the branches containing the inductors.
This leaves only the branch with the ammeter, which also cannot have any current flowing because the rest of the circuit is open due to the inductors. Therefore, the ammeter reading at that instant is zero.
