(Solved): Example: Discharging RC circuit. In the RC circuit shown, the battery has fully charged the capacit ...

Example: Discharging $RC$ circuit. In the $RC$ circuit shown, the battery has fully charged the capacitor, so $Q_0=C?$. Then at $t=0$ the switch is thrown from position a to $\mathrm{b}$. The current $I$ is observed to decrease to 0.50 of its initial value in $40?\mathrm{s}$. a)What is the value of $Q$, the charge on the capacitor, at $t=0$ ? b)What is the value of $R$ ? c)What is $Q$ at $t=60?\mathrm{s}$ ?