1. Three equal charges Qi, Q2 and Q3 are placed at the vertices of an equilateral triangle as shown in the figure below, whose sides are 20 cm. Find the electric force exerted on a proton placed at point A and B by the three charges placed at the vertices of the triangle. Q = -4 pC A В

Q: 10 15 hhee er 0-25mm 0.01

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A: L = 1.44First bracketAnd the  second bracket

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A: average velocity of about 0.994c