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Mathematics is the most important tool of science. The quest to understand the world and the universe using mathematics is as old as civilisation, and has led to the science and technology of today. Learn about the techniques and history of mathematics on


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Question: Two identical spheres are charged, one to 6 µC, and the other to -7 µC. The spheres are allowed to touch, and then are separated. What will be the charge on the two spheres afterwards?

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