question_answer

A coil of self inductance 10 mH and resistance \[0.1\Omega \] is connected through a switch to a battery of internal resistance \[0.9\Omega .\]After the switch is closed, the time taken for the current to attain 80% of the saturation value is : (Take \[\ln 5=1.6\]) [JEE Main 10-4-2019 Afternoon]

A) 0.103 s

B) 0.016 s

C) 0.002 s

D) 0.324 s

Correct Answer: B

Solution :

[b]