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The capacitor shown in figure(a) is charged to steady state by connecting switch S to contact a. If switch S is thrown to contact b at time t=0, which of the curves in figure (b) represents the magnitude of the current through the resistor R as a function of time?
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answer is B.

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Detailed Solution

When switch is shifted to position b discharging will take place
and $q = q_{o} e^{- t / R C}$

$\begin{array}{l} \Rightarrow q = C V e^{- t / R C} \\ and i = - \frac{d q}{d t} = \frac{C V}{R C} e^{- t / R C} \\ \Rightarrow i = \frac{V}{R} e^{- t / R C} \\ at t = 0 circuit current is given as \\ i = \frac{V}{R} \end{array}$

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