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For the given circuit shown in figure below, time constant is

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τ = RC

τ = 2.1 RC

τ = 27 / 4 RC

τ = 3 RC

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detailed solution

Correct option is D

$R_{e q} = \frac{6 R \times 3 R}{6 R + 3 R} + R = 3 R$

$τ = C_{e q} = 3 R C$

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