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Q.

An ideal coil of 10 H is connected in series with a resistance of 5Ω and a battery of 5V. 2 second after the connection is made, the current flowing in ampere in the circuit is

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a

e-1

b

(1-e-1)

c

(1-e)

d

e

answer is B.

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Detailed Solution

We know that i=imax1−e−t/τ Here τ=LR=105=2sec.  So, at t=2sec. and imax=VR=55=1  we get i=11−e−2/2=1−e−1
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