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A positive charge 'Q' is fixed at a poin...

A positive charge 'Q' is fixed at a point A negatively charged particle of mass ' 'm' and charge 'q' is revolving in a circular path of radius `r_(1)` ,with Q' as the centre.The change in potential energy to change the radius of the circular path from `r_(1)` to `r_(2)` in joule is

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