A particle is moving in a circular path of radius $a$ under the action of an attractive potential $U = - {k \over {2{r^2}}}$ Its total energy is:

Question

$ - {3 \over 2}{k \over {{a^2}}}$

Zero

$ - {k \over {4{a^2}}}$

$ {k \over {2{a^2}}}$

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