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94. 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

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94. 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? 8.00 cm 8.00 cm a b 4.00 4.00 -- 4.00 - cm cm cm

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