
$\frac{1}{R_{p}}=\frac{1}{6}+\frac{1}{3}+\frac{1}{2}=\frac{1+2+3}{6}=\frac{6}{6}$
or $\mathrm{R}_{\mathrm{p}}=1\, \Omega$
the equivalent circuit is as shown in the figure.
Current in the circuit, $\mathrm{I}=\frac{2}{5}=0.4 \mathrm{\,A}$




| Column $- I$ | Column $- II$ |
| $(A)$ Drift Velocity | $(P)$ $\frac{m}{n e^{2} \rho}$ |
| $(B)$ Electrical Resistivity | $(Q)$ $\mathrm{ne} v_{\mathrm{d}}$ |
| $(C)$ Relaxation Period | $(R)$ $\frac{\mathrm{eE}}{\mathrm{m}} \tau$ |
| $(D)$ Current Density | $(S)$ $\frac{E}{J}$ |
[Given: $\mathrm{e}^{-1}=0.36$ ]
($A$) The value of the resistance $R$ is $3 \Omega$.
($B$) For $t$
($C$) At $t=t_0+7.2 \mu \mathrm{s}$, the current in the capacitor is $0.6 \mathrm{~A}$.
($D$) For $t \rightarrow \infty$, the charge on the capacitor is $12 \mu C$.
