A constant voltage is applied to a series RL circuit by
wosing the switch. The voltage across inductor of
inductance 2H is 20 V at t= 0 and drops to 5A at 20 ms.
The value of R is
(1) 100 In 222
(2) 100 (1 – In 2)22
(3) 100 In 422
(4) 100 (1 – In 4)12
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