Que$\mathrm{.}4.$

I. Consider the potential system shown in Figure shown below $($a$)$ Set the initial values at the free nodes equal to zero and calculate the potential at the free nodes for five iterations, $($b$)$ Solve the problem by the band matrix method and compare result with part $($a$).$

$[6][$CO$1]$

II$.$ Elaborate how would you solve question $4-$I solved previously by FEM.

$[4][$CO$5]$