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A solenoid having an inductance of 4.77 μH is connected in series with a 1.15 kΩ...

A solenoid having an inductance of 4.77 μH is connected in series with a 1.15 kΩ resistor. (a) If a 12.0 V battery is connected across the pair, how long will it take in seconds for the current through the resistor to reach 77.3% of its final value? (b) What is the current through the resistor at a time t = 1.00τL?

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