Lu Jiao Edition Ninth Grade Physics Volume 2

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"Magnetic Phenomenon" Electromagnetic Phenomenon PPT Courseware

1. Magnetism and magnets

Magnets can attract iron, cobalt, nickel and other substances. This property of magnets is called magnetism.

Magnetic substances are called magnets.

2. Properties of magnets

1. Iron attraction: Magnets can only attract iron, cobalt, nickel and other substances

2. The magnetic strength of each part of the magnet is different. The strongest magnetic part of the magnet is called the magnetic pole.

3. Directivity: For a magnet that can rotate freely, the direction of the magnetic pole is determined when it is stationary.

3. The law of interaction between magnetic poles:

Magnetic poles with the same name repel each other and poles with different names attract each other.

4. Magnetization

1. Some objects that were originally non-magnetic acquire magnetism. This phenomenon is called magnetization;

2. Magnetization method:

By rubbing an object against a magnet in one direction, the object becomes a magnet.

Putting an object close to a magnet can also turn the object into a magnet.

5. Application of magnets

Magnets are widely used in daily life and are inseparable from industrial and agricultural production.

Method 1: Judge based on the iron-attracting properties of the magnet. If a bar-shaped iron block can attract iron powder, it means it is magnetic and is a magnet.

Method 2: Judge based on the directivity of the magnet. Tie the bar-shaped iron block in the middle with a thin wire and hang it up. If it were magnetic, it would stop in the north-south direction. If the piece of iron were not magnetic, it would stop in any direction.

Method 3: Judge based on the interaction between magnetic poles. Take another bar magnet and place its two ends close to one end of the bar magnet. If it attracts twice, it means it is non-magnetic; if it attracts once and repels once, it means it is magnetic.

think about it

There are two steel rods A and B with the same shape. One is magnetic and the other is not. Without any other tools, how do you know which one is magnetic and which one is not?

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Update Time: 2024-11-19

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