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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

$i = i_{0} (1 - e^{- \frac{R τ}{L}}) F o r τ = L / R t h e n i = i_{0} (1 - e^{- 1}) = i_{0} (1 - \frac{1}{e}) = i_{0} (1 - 0.37) = 0.67 i_{0}$

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