Dimensions of self inductance are 

In the circuit shown in the figure, the current through the battery at $t=0$ and $t=\infty$ is, when switch is closed,

Figure shows two bulbs $B_1$ and $B_2$ resistor $R$ and inductor $L$, when the switch $S$ is turned off

When the current in the portion of the circuit shown in the figure is $2 \mathrm{A}$ and increasing at the rate of $1 \mathrm{A} {\mathrm{s}}^{-1}$, the measured potential difference $V_{\mathrm{ab}}=8 \mathrm{V}$. However when the current is $2 \mathrm{A}$ and decreasing at the rate of $1 \mathrm{A} {\mathrm{s}}^{-1}$, the measured potential difference $V_{\mathrm{ab}}=4 \mathrm{V}$. The values of $R$ and $L$ are