In the given circuit, each resistance is $r=18.75 \mathrm{\Omega }$. The current (in $\mathrm{A}$) in the resistance connected across $A$ and $B$ is,

The figure shows an experimental plot discharging of a capacitor in an $RC$ circuit. The time constant $\mathrm{\tau }$ of this circuit lies between:

In an $LCR$ circuit, as shown below, both switches are open initially. Now the switch $S_1$ is closed and $S_2$ kept open. ($q$ is the charge on the capacitor and $\mathrm{\tau }=RC$ is the capacitive time constant). Which of the following statement is correct?