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# force - Note-A-Rific Force on Wires We saw in a previous...

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Note-A-Rific: Force on Wires We saw in a previous section that a current in a wire can create a magnetic field. If that wire has a magnetic field around it, it should feel a force if it is brought near another magnet. This effect was shown by Oersted when he placed a current carrying wire into a magnetic field and watched what happened. The wire is running into the page, with electron flow current shown by the arrow. Oersted wondered if the wire would be attracted towards one of the poles of the magnet… this would mean that it would go left or right. Instead, he measured a force that (in the diagram above) pushed the wire up! o In this case the force, the current, and the magnetic field are all acting at right angles to each other. Force ! Up Current ! into page Magnetic field ! to the right (north to south!) The three vectors are perpendicular to each other. Anytime we need to draw vectors pointing into the page (away from you) or out of the page (towards you) we will use the following symbols… 1. The “into page” is supposed to look like the feathers on the end of an arrow or dart that is flying away from you. 2. The “out of page” is supposed to look like the tip of an arrow coming at you.

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