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Two insulated charged copper spheres A a...

Two insulated charged copper spheres A and.B of identical size have charges `q_A ` and `q_B ` respectively. A third sphere C of the same size but uncharged is brought in contact with the first and then in contact with the second and finally removed from both. What are the new charges on A and B?

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The correct Answer is:
` +Q//2 - Q//4 - Q//4`
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