Notes_Magnetism_2013_KEY

# The greeks discovered this through the use of

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• apiccirello
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The Greeks discovered this through the use of Lodestone. Where is Earth’s magnet ic north pole? The north pole of a compass needle points to Earth’s geographic North because it is a south magnetic pole. Think about it! A compass needle is a magnet that is free to spin. The north pole of a compass needle (magnet) will always point towards the south pole of another magnet. What is magnetic declination? It is the difference between the direction a compass points and the direction of true north. Earth behaves like a giant magnet . 16.3 Check Questions 1. Is Earth’s magnetic north pole at its geographic north pole? Explain. No, the Geopraphic North Pole is Earth s South Magnetic Pole. This is because the North end of the magnet points up, so it must be attracted to the opposite pole. 2. Why does a compass point north? The compass points to Geographic North, which is really the magnetic South Pole. Therefore the North Pole of the compass is attracted to the South magnetic end of Earth. 3. What is magnetic declination? It is the difference between the direction a compass points and the direction of true north.

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8 | P a g e Investigation #1 The Electromagnet 1. Try to pick up the paper clips by touching them with the nail. What happens? ______________________________________________________________________ ______________________________________________________________________ ______________________________________________________________________ 2. Hook up a battery to the wire on the nail so that electricity is running through the wire. 3. Try again to pick up the paper clips. What happens? Why? ______________________________________________________________________ ______________________________________________________________________ ______________________________________________________________________ 4. Now disconnect the battery and try the paper clips again. Does the same thing happen as in step 3? What has happened to the nail? ______________________________________________________________________ ______________________________________________________________________ ______________________________________________________________________
9 | P a g e 5. Experiment with how many paper clips the nail can pick up. Each nail has a different number of wraps of wire around it. Investigate the relationship between the number of wraps and how many paper clips are picked up. Record the number of paper clips that you pick up each time in the table below. # Wraps 10 20 30 40 50 60 80 # Paper Clips 6. What can you conclude about the number of wraps around the nail and the number of paper clips it can hold? Explain why. 7. Predict what will happen to the number of paper clips picked up if you increase the current through the electromagnet. 8. Construct a graph using Microsoft Excel showing how the number of paper clips picked up by the magnet varies as the number of wraps are increased. 9. Prepare a poster summarizing the results of this experiment. Include your data table and graph on the poster. 10. Look at other grou ps’ electromagnets, data tables, and graphs. Did some electromagnets work better than others?

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10 | P a g e Poster Project Physics Your 3-dimensional poster must contain the following information: 1. The first, middle (if applicable) and last name of your scientist. 2. One sentence explaining why your scientist is famous. 3. A picture of your scientist. 4. Date of birth.
• Fall '12
• Beatty
• Current, Magnetism, Magnetic Field, Magnet, South Pole, North Magnetic Pole

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