(21-14) Two small nonconducting spheres have a total charge of 90.0μC. (a) When placed 1.16 m apart,

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(21-14) Two small nonconducting spheres have a total charge of 90.0μC. (a) When placed 1.16 m apart, the force each exerts on the other is 12.0 N and is repulsive. What is the charge on each? (b) What if the force were attractive?
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I was struggling it too but I didn’t get, the next step it’s not clear I mean

sadiaa.