Задача 30207.

Two identical balls with a radius of 1.7 cm are hung on silk threads 0.7 m long at one point. When the balls were charged with 2.2 * 10 ^ -6 C, the filaments parted at an angle of 90 °. What is the density of the material of the balls and the force of electrostatic repulsion between them?

Detailed solution with a short recording of the conditions, laws and formulas used in the decision, the withdrawal of the calculation formula and the answer.
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