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If you take a piece of wood and put it next to another piece of wood... nothing happens. And if you take a piece of granite and put it next to another rock... still nothing. But if you take this piece...
Shh... I've snuck into minutephysics' studio to explain how a wing actually works Hang on, something doesn't feel right. Ah, that's better. Now everyone knows that a...
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Only a few elements can be permanent magnets - iron is one. Copper is not. But if you pass an electric current through any metal it becomes a magnet - an electromagnet. But how does this work? Well...
