81. A charged ball weighing 300 g is suspended from a t

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81. A charged ball weighing 300 g is suspended from a thread. When a ball charged with the same charge with a radius of 2 cm was brought up to it at a distance of 40 cm from the bottom, the tension force of the thread decreased by 4 times. Determine the surface density of the electric charge on the presented ball.

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Detailed solution. Decorated in Microsoft Word 2003. (Target decided to use formula editor)

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