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Two points charges are located on the x-...

Two points charges are located on the x-axis, `q_1=-1muC` at `x=0 and q_2=+1muc` at `x=1m`.
a. Find the work that must be done by an external force to bring a third point charge `q_3=+1muC` from infinity to `x=2m`.
b. Find the total potential energy of the system of three charges.

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