Bryson and Diego decide to work a practice problem. A resistor, inductor, and a battery are arranged in a circuit. The circuit has an inductance of L = 1.2 H, and a resistance of 2 km2. Switch S, is suddenly closed at t 0. Find the time needed for the current to reach a fraction f = 0.5 of its maximum value.

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The current in an RL circuit after the switch is closed is given by the equation ... View the full answer