Electric potential:

$\overline{){\mathit{V}}{\mathbf{=}}\frac{\mathbf{kq}}{\mathbf{r}}}$

**(a)**

r_{1a} = r_{2a} = (1/2)hypotenuse = (1/2)[(3.5^{2} + 3.5^{2})^{(1/2)}] = 2.475cm(1m/100cm) = 0.02475m

Point charges q_{1} = +2.00 μC and q_{2} = -2.00 μC are placed at adjacent corners of a square for which the length of each side is 3.50 cm. Point a is at the center of the square, and point b is at the empty corner closest to q_{2}. Take the electric potential to be zero at a distance far from both charges.

A) What is the electric potential at point a due to q_{1} and q_{2}?

B) What is the electric potential at point b?

C) A point charge q_{3} = -5.00 μC moves from point a to point b. How much work is done on q_{3} by the electric forces exerted by q_{1} and q_{2}?

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