A uniform conducting wire of length $12a$ and resistance R is wound up as a current carrying coil in the shape of an equilateral square of side a. the coil is connected to a voltage source of $V_0$ Find the magnetic moment of the coil .

Question

$\begin{array}{1 1} 3aI \\ 4a^2I \\ 3a^2I \\ 4aI \end{array} $