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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: A positively charged rod is brought close to a neutral metallic sphere. The demonstrator touches the other side of the sphere briefly, then removes the rod. What is the net charge on the sphere?

Go to the article about: Electrostatics


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Philosophy is just a way of talking about discoveries that have already been made.

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