For the circuit shown in Fig. $2\mathrm{.}181,$ determine current through $R_2$ when $k$ takes values of $S$ and $10[0\mathrm{.}588$ A$,0\mathrm{.}408$ A$|$ Wetwort Theorein and Fields, Madras Umiv.$)$

Determine Thevenin's equivalent circuit which may be used to represent the network of Fig. $2\mathrm{.}182$ ax the terminals $AB.$

$1V_d=4\mathrm{.}8V,R_m=2\mathrm{.}4q$