A particle is moving in a circular path of radius a under the action of an attractive potential $$U=-\frac{k}{2r^{2}}$$
. Its total energy is :-
(1) $$-\frac{k}{4a^{2}}$$
(2) $$\frac{k}{2a^{2}}$$
(3) Zero
(4) $$-\frac{3}{2} \frac{k}{a^{2}}$$