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The two charges in the figure below are separated by d = 4.00 cm. (Let q1 = -16 nC and q2 = 26.5 nC.) (a) Find the electric potential at point A. (b) Find the electric potential at point B, which is halfway between the charges.
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\[U(r) = \frac{1}{4\pi \epsilon_0}*\frac{q}{r}\] is the formula for electric potential due to a point charge at distance r with a charge of q. Epsilon in the equation is vacuum permittivity. U(r) is a linear function so you just need to sum up the potentials created by both of the charges.
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