Question

Three point-like charges are placed at the corners of an equilateral triangle as shown in the figure, a = 32.0 cm. Find the magnitude of the electric force exerted on the charge q33 . Let q11 = −1.60 µC, q22 = +4.20 µC, and q33 = −3.60 µC

2 1

Answer 1

force between q1 and a3

F13 = k q1 q / r^2

F13 = 9*10^9* 1.6*3.6*10^-12 / 0.32^2

F13 = 5.06*10^5 N

force between q2 and q3

F23 = 9*10^9* 3.6*4.2*10^-12 / 0.32^2

F23 = 13.29*10^5 N

angke between these two forces

x = 60 + 60 = 120

resultant firce acting on q3

F^2 = F13^2 + F23^2 + 2 * F13* F23* cos x

F = 11.618*10^5 N

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