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A charged partile is moved infinitesimal...

A charged partile is moved infinitesimally slowly from point A to B in a region of space containing electric field by an external agent. Work done by the external agent is 50 J . Two students calculate the potential energy of the particle at A and B. Student X reports to the teacher the values of potential energy at A and B are 50 J and 100 J while student Y reports then to be 70 J and 120 J . Which of the two students is wrong ?

A

X

B

Y

C

Both are correct

D

Both are incorrect

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