Question

In a LR circuit with source, the current reaches to one third of it's maximum value within 5sec. Find the time constant of the circuit.

Answer 1

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The time required for the current flowing in the LR series circuit to reach its maximum steady state value is equivalent to about 5 time constants or 5τ. This time constant τ, is measured by τ = L/R, in seconds, where R is the value of the resistor in ohms and L is the value of the inductor in Henries.