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Question

Work done by the centripetal force is always .....................


A
zero
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B
Infinity
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C
more than zero 
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D
non of these
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Solution

The correct option is A zero
we know centripetal acceleration is:Any motion in a curved path represents accelerated motion, and requires a force directed towards the centre of curvature of the path.
according to definition:work is done whenever the given condition is satisfied.
(i) a force should act on an object
(ii) there is a displacement of the body caused by the applied force along the direction of the applied force.
No displacement takes place in this case.
so,Work done by a centripetal force is always zero

Physics

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