Log1989 task number 14.27

Log1989 task number 14.27

A charged ball A with a radius R = 2 cm is brought into contact with an uncharged ball B with a radius R₂ = 3 cm. After the balls were separated, the energy of the ball B turned out to be equal to W₂ = 0.4 J. What charge q was on the ball A before their contact?

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