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Coulomb's Law - Vector Form

Two insulated...

Question

Two insulated charged copper spheres $A$ and $B$ of identical size have charges $q_{A}$ and $- 3 q_{A}$ respectively. When they are brought in contact with each other and then separated, what are the new charges on them?

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Solution

Charge on each $= \frac{q_{A} - 3 q_{A}}{2} = - q_{A}$ .

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