Задача id12977

A sphere of radius r1, carrying a charge + q1, is surrounded by a metal mesh of radius r2 (Fig. 99), on which a charge +q2 is applied. A ball with mass m, carrying a charge + e, begins to move near the sphere without an initial speed. Having flown through the net, the ball moves away to infinity. What will be its speed at a large infinite distance from the sphere?

Detailed solution. Format gif