a positive charge q is carried slowly from a point x to point y in an electric field of point charge +Q. the work done by external force is​

Dear student,
work done by external agent = cahnge in potential energy
                                                 = (PE)final - (PE)initial
                                                = (KQq/r2)- (KQq/r1)
where r1 and r2 are the separation between charges
put value of them in term of x, y from daigram you have


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