Two point charges (+ 10.0nC and 10.0nC) are located 8.00 cm apart. (a) What is the electric

Two point charges (+ 10.0nC and ˆ’ 10.0nC) are located 8.00 cm apart.
(a) What is the electric potential energy when a point charge of ˆ’ 4.2nC is placed at points a, b, and c in turn? Let U = 0 when the ˆ’ 4.2nC charge is far away (but the other two are still in place).
(b) How much work would an external force have to do to move the point charge from b to a?

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