AP Physics C: E&M
13.5 Circuits with Resistors and Inductors (LR Circuits)

Which row in the table correctly identifies the current in the circuit immediately after the switch is closed (at \(t = 0^+\)) and the inductive time constant \(\tau\) of the circuit?
| Row | Current at \(t = 0^+\) | Inductive time constant \(\tau\) |
|---|---|---|
| Row A | \(\dfrac{\mathcal{E}}{R}\) | \(\dfrac{R}{L}\) |
| Row B | \(\dfrac{\mathcal{E}}{R}\) | \(\dfrac{L}{R}\) |
| Row C | \(0\) | \(\dfrac{L}{R}\) |
| Row D | \(0\) | \(\dfrac{R}{L}\) |
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