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| Unit 1: Active Physics |
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- a) Sketch the compass direction at different places on the horizontal surface in your log.
3. Bring another type of magnet, such as a bar magnet, into the area near the compass needle.
- a) Describe your observations in your log.
- b) What happens to the dependable north-pointing property of a compass when the compass is placed in a region where magnetic effects, in addition to Earth’s magnetic field, exist?
4. You will now make a map of the magnetic field of the bar magnet. Place the magnet on another piece of paper and trace its position. Place the compass at one location and note the direction it points. Remove the compass.
- a) Put a small arrow at the location from which you removed the compass to signify the way in which it pointed.
- b) Place the compass at a second location about at the tip of the first arrow. Remove the compass and place another small arrow in this location to signify the way in which the compass pointed.
- c) Repeat the process at an additional 20 locations to get a map of the magnetic field of a bar magnet. Tape the piece of paper of the map in your log.
5. Return the compass to the horizontal surface surrounding the wire. Observe the orientation of the compass. Send a current through the wire. The direction of the flow of electrons which make up the current in the wire is from the negative terminal of the power supply to the positive terminal. Move the compass to different locations on the horizontal surface, observing the direction in which the compass points at each location. Make observations on all sides of the wire, and at different distances from the wire.
- a) Record how the compass was oriented when the bar magnet was removed.
- b) Describe any pattern that you observe about how the compass behaves when it is near the current-carrying wire. Use a sketch and words to describe your observations in your log.
- c) From your observations, what effect does the electric current appear to have on the wire?
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