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What is the time constant of an inductive circuit?

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What is the time constant of an inductive circuit?

(a) LR

(b) R/L

(c) 1/LR

(d) L/R
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The correct option is (d) L/R

The best explanation: The time constant in an inductive circuit is the time taken for the voltage across the inductor to become 63 percent of its initial value. It is given by Time constant = L/R.
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