Решить задачу(во вложении) .. если требуется чертеж то начертить
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Fк = q*E=q*sigma/(2*e*e0)E= sigma/(2*e*e0) - по теореме Гаусса
Fк / (m*g) = tg (alpha)
(q*sigma/(2*e*e0)) / (m*g) = tg (alpha)
q= (2*e*e0*m*g *tg (alpha) ) / sigma