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Two identical metallic spheres are suspended as bobs of a simple pendulum as shown in the figure. The spheres come to equilibrium when a charge of +7.5×10^–9 C, with each string making an angle 5° with the vertical. The string is 0.5 m long. Find the electric force between the spheres.

5° 5°
0.5 m
0.5 m

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