Question

A coil of self inductance 10 mH and resistance 0.1 Ω is connected through a switch to a battery of internal resistance 0.9 Ω. After the switch is closed the time taken for the current to attain 80% of the saturation values is: [take ln 5 = 1.6] (A) 0.016 s (B) 0.324 s
(C) 0.002 s (D) 0.103 s

Answer 1

$\huge\bold{0.016s}$

Answer 2

Answer:

A coil of self inductance 10 mH and resistance 0.1 Ω is connected through a switch to a battery of internal resistance 0.9 Ω. After the switch is closed the time taken for the current to attain 80% of the saturation values is

: [take ln 5 = 1.6] (A) 0.016 s ✓✓

B) 0.324 s

(C) 0.002 s (D) 0.103 s