magnatic needle detergent glass of water cork is used to make of dash
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Answer:
Rub the magnet against the sewing needle at least five times. (If you are using a weaker magnet, such as a flat refrigerator magnet, rub the needle at least a dozen times.) Always rub the magnet in the same direction against the needle. Your needle should now be magnetized.
Now cut off about one quarter inch of the cork from one of the ends, making a small cork disk that is about one-quarter-inch tall.
Laying the cork disk on a flat surface, carefully push the needle through the side of the disk by using the pair of pliers. Push the needle all the way through the disk so that about the same amount of needle shows on either side of the disk.
Fill a wide cup, drinking glass or bowl with at least one inch of water.
Put the cork disk (with the needle) on the water in the cup. Try to keep the disk floating in the center of the water, away from the sides of the cup. What does the needle do? When it stops moving, what direction does it point toward?
Does your homemade compass seem to work well? How is it limited in its use?
Extra: Find out what direction north is in your location. Did your needle point in that direction? (You can use a real compass, an atlas or smartphone map for this.)
Extra: Put a magnet next to your compass. What happens to the needle as the magnet is moved close to it? How close does the magnet need to be to affect the compass? You could also try this with a steel object (such as a nail or possibly the pliers).
Extra: If you have magnets with different strengths, such as a flat refrigerator magnet and a rare earth magnet, try making multiple compasses using the different magnets to magnetize the needles. How well do the different compasses work compared with one another?
Extra: There are other ways you can make an inexpensive magnetic compass at home or while you are outdoors. For example, instead of using a piece of cork, you could try using a small leaf and setting the needle on top of the leaf while it floats in a still pool of water. How does a compass made using a leaf compare with one made using a piece of cork? How else could you make a magnetic compass?
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