How Special Relativity Makes Magnets Work
MinutePhysics on permanent magnets: http://www.youtube.com/watch?v=hFAOXdXZ5TM Subscribe to Veritasium: http://bit.ly/SuBVe Support Veritasium- get a t-shirt: http://dft.ba/-vetshirt Subscribe...
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Only a few elements can be permanent magnets - iron is one. Copper is not. But if you passan electric current through any metal it becomes a magnet - an electromagnet. But how doesthis work? Well strangely enough, it's a consequence of special relativity.Special relativity is the fact that in our universe, length and time aren't absolute;they're perceived differently by observers moving relative to each other (hence, "relativity").For example, if you measure carefully enough, you'll find that time passes slower for observersmoving relative to you.Hey Derek, when did you last shave? Derek1: Six hours ago.MovingDerek: Actually it was five hours, 59 minutes and 59.99999999999 secondsAnd moving objects are also contracted...
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Only a few elements can be permanent magnets - iron is one. Copper is not. But if you passan electric current through any metal it becomes a magnet - an electromagnet. But how doesthis work? Well strangely enough, it's a consequence of special relativity.Special relativity is the fact that in our universe, length and time aren't absolute;they're perceived differently by observers moving relative to each other (hence, "relativity").For example, if you measure carefully enough, you'll find that time passes slower for observersmoving relative to you.Hey Derek, when did you last shave? Derek1: Six hours ago.MovingDerek: Actually it was five hours, 59 minutes and 59.99999999999 secondsAnd moving objects are also contracted...
