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A particle is moving in a circular pa...

A particle is moving in a circular path of radius a under the action of an attractive 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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