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Two identical pith balls are charged by...

Two identical pith balls are charged by rubbing against each other. They are suspended from a horizontal rod through two strings of length 20 cm each, the separation between the susjpension points being 5 cm. in equilibrium, the separation between the balls in 3 cm. Find the mass of each ball and the tension in the strings. the charge on each ball gas a magnitude `2.0 xx 10^(-8) C.`

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