A system consists of a uniformelectric field of 73.5 N/C, directed in the positi

Question

A system consists of a uniformelectric field of 73.5 N/C, directed in the positivex direction, together with a particle having a positivecharge of 3.46×105 C. The particle is moved fromthe location x = 3.50 m to the locationx = 1.50 m in the field, and it isstationary before and after it is moved.

(a) What is the work done on the system by theexternal force?
(b) What is the work done by the field on theparticle?
(c) What is the change in the potential energy of the system?



I came up with:
   (a) 5.09e3 J
   (b) 5.09e3 J
   (c) 5.09e3 J
Which is incorrect...

Please help me understand how to get the correct answer.

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