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Electromagnetism
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Pass an electrical current through a wire and something amazing happens: a magnetic field is produced! You can show this by passing current through an insulated wire near a compass, although iron filings will also do.
Turning the current on and off will cause the compasses to deflect. Shown below are four compasses near a wire that comes towards the camera.
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- Move your mouse over the image: the image changes to show that the current is on, flowing towards the camera. The compasses show the magnetic field.
- Move the mouse off and we reverse the direction of current (away from the camera), leading to the opposite magnetic field.
- Click here, or the image, to refresh the page, making sure you move the mouse away.
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