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Two point charges, Q_{1}= + 5.00 nC and Q_{2}= -3.00 nC, are separated by 35.0 cm. (a) What is the potential energy of the pair? What is the significance of the algebraic sign of your answer? (b) What is the electric potential at a point midway between the charges?

(a)

U = k_{e}* (5*10^{-9}) * (-3*10^{-9}) / .35

U = -3.85*10^{-7}Nm

I have no idea what the significance of the algebraic sign is.

(b)

V_{1}+ V_{2}= k_{e}/.175 * (5-3)*10^{-9}

V_{1}+ V_{2}= 102.611

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# Homework Help: What is the potential energy of the pair?

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