Two point charges of mass m each are suspended in the gravitational field of the Earth by two non-conducting massless strings, each of length 1, attached to the same fixed point. The spheres are given equal charges Q of the same sign. As a result each string makes angle a to the vertical (see figure below). Calculate m, if 1 = 76.4 cm, Q = 4 μC and α = л/6. Take Coulomb constant ke =8.99×10° N m² C-2. Give your answer in grams. Answer: d D M M Q 60 g

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