Question

How long does it take for an RL circuit to get to two-thirds of its maximum...

  1. How long does it take for an RL circuit to get to two-thirds of its maximum current? (where τ is the time constant of the circuit)
  1. 0.368 τ
  2. 0.405 τ
  3. 0.693 τ
  4. 1.10 τ
  5. 1.95 τ
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Answer #1

During charging, the current through an RL circuit as a function of time is

So, we get

  
And so for
  
we get
  
  
  
So, option (d) is correct.

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