The first metal sphere of radius 5 cm is positive

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The first metal sphere of radius 5 cm has a positive charge 25 nC, the second metal sphere of radius 15 cm has a negative charge (-5 nC). Balls is brought into contact and then diluted to the original distance. Find what turned out to be a charge after that first ball.

Task 30942. Detailed solution shorthand terms, formulas, laws used in the decision, the withdrawal of the calculation formula and the response.

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