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

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Two point charges (+10.0 nC and −10.0 nC) are located 8.00 cm apart. 

(a) What is the change in electric potential energy when a third point charge of −4.2 nC is moved from point c to point b?
(b) How much work would an external force have to do to move the point charge from a to b?

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