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A particle is moving in a circular path ...

A particle is moving in a circular path of radius a under the action of an attraction potential `U = - (k)/(2r^(2))`. Its total energy is

A

zero

B

`-(3)/(2)(k)/(a^(2))`

C

`-(k)/(4a^(2))`

D

`(k)/(2a^(2))`

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