How do I demonstrate the magnetic field around a wire?

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Komba Tumoe

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Komba Tumoe asked the Naked Scientists:
   
How would you demonstrate that a curent flowing in a wire produces a magnetic field around it?

What do you think?
« Last Edit: 06/02/2011 19:30:04 by _system »

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Offline lightarrow

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How do I demonstrate the magnetic field around a wire?
« Reply #1 on: 06/02/2011 19:34:22 »
With a compass: approach the compass to the wire from above and you will see the needle to rotate ortogonally to the wire direction (if the needle wasn't already in that direction, of course).