physics

a charge of 4.0nc is at (0,0) and a second charge of -2.0nc is at (3.0,0.0m).
If the potential is taken to be 0 at infinity, What is the

a.electrical potential at (0.0,4.0m)

b.pe of a 1.0nc charge at (0.0,4.0m).

c.work required to bring a charge 1.0nc from infinity to (0.0,4.0m)

d.total pe of the 3charged system.

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