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Give example of a situation in which an ...

Give example of a situation in which an applied force does not result in a change in kinetic energy.

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When a charged particles moves in a uniform normal magnetic field the parth of the particle si ciruclar as given field is uniform hence, radius of the circular path is also constant.
As the force is central and movement is tangential work done by the force is zero, As speed is also constant we can say that `DeltaK=0`
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