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A 2.20 mH inductor is connected in series woth a dc battery of negoigible internal resistance,...

A 2.20 mH inductor is connected in series woth a dc battery of negoigible internal resistance, a .820 KO ressistor, and an open switch.

a) how long after the switch is closed will it take for the current in the circuit to reach half of its maximum value?

b) how long after the switch is closed will it take for the enegry stored in the inductor to reach half of its maximum value?
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