Two identical tiny metal balls carry charges of 186 nc and, Ask an Expert

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Two identical tiny metal balls carry charges of 18.6 nC and -17.3 nC and are separated by a distance of 15 cm.

a) What is the force acting between the two balls? (Repulsive positive.)

b) The balls are brought together, touch, and then moved back to their original positions. Now what is the force acting between them?

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