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The two point charges are located on the x- axis, q1=-e at x=0 and q2=e at...

The two point charges are located on the x- axis, q1=-e at x=0 and q2=e at x=2a.

     A- Find the work that must be done by an external force to bring a third point charge q3=2e from infinity to x=4a.

B- Find the total potential energy of the system of three charges.

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