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Charged spheres, each with a charge Q = 500 nC, are placed at the ends of three chords of length 0.200 m that are

Charged spheres, each with a charge Q = 500 nC, are placed at the ends of three chords of length 0.200 m that are connected at angles of 120 degrees as shown. What is the magnitude of the resultant force on the knot at the centre? Give your answer in units of mN, accurate to the nearest whole number. Hint: consider symmetry.

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