Задача 31499.

Two point charges Q1 = 6,6 * 10 ^ -9 C and the Q2 = 1,32 * 10 ^ -9 Cl are at a distance r1 = 40 cm. What we must do the work, to bring them closer to the distance r2 = 25 cm?

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