In a circuit made up of inductor, resistance, ammeter, battery, and switch in series, at which o...

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In a circuit made up of inductor, resistance, ammeter, battery, and switch in series, at which of the following times after the switch is closed is the rate of increase of current greatest?
(A) The rate of current increase does not change in time
(B) One time constant
(C) Reciprocal of one time constant
(D) Zero
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