Question

Answer in 30-40 words. 1. Describe the single-touch method for preparing magnets. Explain your answer with a diagram. 2. If you cut a magnet into two pieces, how will the polarity be affected? 3. Describe three precautions for retaining magnetism. 4. Explain with a diagram, how you can prepare a compass of your own.​

Answer 1

1. Describe the single-touch method for preparing magnets. Explain your answer with a diagram.

• Single-touch method is one of various ways of making a magnetic material like soft iron into a magnet. In this method one end of the magnet (say north pole) is placed at one end (say end A) of the iron piece and then rubbed over the bar from end to other (say end B), then lifted and brought back to first end. Please refer to attached image 1 for diagram explanation!

2. If you cut a magnet into two pieces, how will the polarity be affected?

• Each one reinforces the magnetic fields of the others. Each one has a tiny north and south pole. If you cut one in half, the newly cut faces will become the new north or south poles of the smaller pieces.

3. Describe three precautions for retaining magnetism.

• We should never heat a magnet over a burner and hit a magnet with a hammer.
• We should never drop a magnet on the floor.
• We should store the magnets properly (when not in use).

4. Explain with a diagram, how you can prepare a compass of your own.

• Materials

1. Sewing needle about 1-2 inches long
2. Small bar magnet or refrigerator magnet
3. A small piece of cork (a flat piece from a wine bottle works but make sure it is cork and not plastic)
4. A shallow bowl
5. Pliers

• Let's Make a Compass

1. To magnetize the needle: Rub a magnet along the needle a few times in one direction only. Cut off a small circle at one end of the cork (about ¼’ thick).
2. Securely grip the needle with the pliers and with the circle of cork on a flat surface, push the needle through one end of the cork and out the other so that the needle is sticking out of both ends of the cork evenly. (Be careful).
3. Fill the bowl half-way with water and float the “compass” on the surface of the water.
4. Place the whole “compass” on a flat surface and watch the needle as it tries to align itself with the magnetic fields. The needle should point towards the nearest magnetic pole (north or south) depending on where you live.
5. Now go test out your new compass and see if you can orient yourself on a map! Please refer to attached image 2 and 3 for diagram explanation!

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