Challenge To Excellence Science Fair Project MAGNETS AND CHARGE. By: Austin Abt Mrs. Crane 4 th Grade Class. How does charge affect the strength of homemade magnets?. Hypothesis.
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By: Austin Abt
Mrs. Crane 4th Grade Class
1. You will use four of the nails to make magnets, and save one nail as a negative control. That means that you will not charge the control magnet, and will see if it has any magnetic properties on its own.
2. To make the four magnets, wrap insulated copper wire clockwise around each nail, tightly, with different numbers of wraps: 5, 10, 15, and 20.
3. Leave about 3 inches of loose wire at each end of the nail. Cut the wire with wire cutters after you've wrapped each nail. You now have four electromagnets.
4. Strip the last 1/2 inch of wire at each end with the wire strippers.
5. Next, attach each electromagnet to the 9-V battery, one at a time, to test the strength of each magnet. Record the observations in your lab notebook.
6. You will want to connect each electromagnet to the battery in the same way. Wrap the pointy end of the nail wire to the positive battery terminal, and the flat end of the nail wire to the negative battery terminal.
7. To measure the strength of each magnet, use iron shavings. Pour your iron filings into one of the paper cups. Dip the tip of one electromagnetic nail into a cup of iron shavings and remove. What do you see? Record all observations in your lab notebook.
8. If there are any iron shavings stuck to the nail, move the nail over a clean cup to remove them. While holding the nail and iron shavings over the cup, disconnect one of the ends of wire from the battery terminal. What happens?
9. If there are any pieces of iron shavings still stuck on the magnet, brush them off into the cup.
10. Label the cup with the type of electromagnet used (5, 10, 15, or 20 wraps) or with "control," and set the cup aside.
11. Repeat steps 6–10 with the other magnets, and steps 7–10 with your un-magnetized control nail.
12. Now you need to weigh each of your cups on the kitchen digital scale and write your data in a data table, like the one shown below, in your lab notebook:
Number of Wraps
Weight of shavings