Electronics - Inductors - Discussion


If the switch is moved to position 1 in the given circuit, how long will it take for the current to reach its maximum value?

[A]. 72.5 mu.gifs
[B]. 532 mu.gifs
[C]. 610 mu.gifs
[D]. 833 mu.gifs

Answer: Option B


No answer description available for this question.

Prudvi said: (May 31, 2011)  
Please tel me how to solve it!

Rashid Call3135791000 said: (Aug 7, 2011)  
It is RL circuit, we use Vs=R + Inductor.

Priya said: (Nov 23, 2011)  
Time constant for RL circuit is t = L/R


5 time time constants it will to reach its max value. t = 5*0.1063829ms = 532 us.

Kiran said: (Nov 27, 2012)  
How we had taken resistance value?

Tushar Sharma said: (May 28, 2013)  
Time constant for LR circuit is t = L/R.
Now R=120+820 = 940R.
L = 100mH.

So t = L/R

To reach maximum i.e. 100% value; it will take 5 time constants,
5 Time constants.

1T 63.2%
2T 86.4%
3T 94.9%
4T 98.1%
5T 100%

T = 5*0.1063829ms = 532us.

Yateesh Kumar Vc said: (Mar 3, 2016)  
On which basis t is multiplied by 5. I didn't please solve this problem.

Balu said: (Apr 28, 2017)  
Because the current will have reached 99.5% of the steady state value after 5 time constants.

Pritam said: (Apr 22, 2020)  
At position 2 inductor is discharging.

Before coming to position 1 inductor is completely discharged.

Its general formula for complete charging of capacitor and inductor 5T.


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