- #1
DaveC426913
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This is a new one one me:
http://www.iflscience.com/physics/4-examples-relativity-everyday-life
If a charged object sits still next to an electromagnet, then nothing happens to it. Even though the electrons are flowing, they occupy a similar amount of space to the protons so that over all the electrified metal has no effect on it.
However, if this charged object moves alongside the wire, then it starts to feel the effects of length contraction in the moving electrons. This means that the density of stationary protons becomes larger than the flowing electrons and the metal exhibits a positive charge, causing the object to be attracted or repelled.
http://www.iflscience.com/physics/4-examples-relativity-everyday-life