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Q.

The time constant of an LR circuit represents the time in which the current in the circuit

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a

Attains a constant value 

b

Reaches a value equal to about 37% of its final value

c

Reaches a value equal to about 63% of its final value

d

Attains 50% of the constant value

answer is B.

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Detailed Solution

i=i0(1-e-RτL) For τ=L/R then i=i0(1-e-1)=i0(1-1e)=i0(1-0.37)=0.67i0

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