A 320 H coil is in series with a 3 3...

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A 320 µH coil is in series with a 3.3 kΩ resistor. How long does it take for current to build up to its full value?

A. 0.48 s

B. 0.48 ms

C. 0.48 µs

D. 48 s

Answer: Option C

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Comments ( 2 )

Engr Farman :

3 years ago

time constant T=(L/R)
to reach max current it will take appr 5T
time=5(320u/3.3k)
=0.48us
Kusheshwar Mandal :

4 years ago

explane formula use kardo yar

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