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4. A DC RL circuit is initially unplugged. At time t = 0, the circuit is plugged into a 15V battery. If the circuit

4. A DC RL circuit is initially unplugged. At time t = 0, the circuit is plugged into a 15V battery. If the circuit has a resistor of 1k and an inductor with 100 mH inductance, how long does it take for the circuit to be 25% fully charged? 63% charged? 95% charged?

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