A uniform conducting wire of length `` 12\, a `` and resistance `` ' R ' `` is wound up as a current carrying coil in the shape of,
(i) an equilateral triangle of side `` 'a' `` .
(ii) a square of side `` 'a' `` .
The magnetic dipole moments of the coil in each case respectively are:
(A) `` \sqrt{3} Ia ^{2} `` and `` 3\, Ia ^{2} ``
(B) `` 3\, Ia ^{2} `` and `` Ia ^{2} ``
(C) `` 3\, Ia ^{2} `` and `` 4\, Ia ^{2} ``
(D) `` 4\, Ia ^{2} `` and `` 3\, Ia ^{2} ``