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A capacitor of C = 2µF is charged to its maximum emf 2V and is discharged through a resistance of 10⁴Ω. The charge on capacitor when t = CR is (nearly)

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0.5µC

4µC

1.5µC

2.5µC

answer is C.

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Detailed Solution

$Q = Q_{0} e^{- t / RC}$

$w h e n t = C R, Q = Q_{0} e^{- 1} = 0.366 Q_{0} = 0.366 (4 μ C)$

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