"Magnetic Phenomena: Magnetic Field" Electricity and Magnetism PPT Courseware 4

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"Magnetic Phenomena: Magnetic Field" Electricity and Magnetism PPT Courseware 4

1. Magnetism:

1. Magnetism: Objects have the property of attracting iron, cobalt, nickel and other substances.

2. Magnet: A magnetic object.

3. Classification of magnets:

Temporary magnet Artificial magnet

permanent magnet natural magnet

Permanent magnet: An object that can maintain magnetism for a long time.

Magnetic needles, bar magnets, hoof magnets, and ring magnets are all permanent magnets.

2. Magnetic pole:

1. Magnetic pole: The strongest magnetic part of the magnet.

(Each magnet has 2 poles)

2. One end of the guide is called the south pole of the magnet, or the S pole.

The end pointing north is called the north pole of the magnet, or the N pole.

3. Interaction:

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

3. Magnetization and demagnetization:

1. Magnetization:

⑴Definition: The process of making a non-magnetic object lose its magnetism.

⑵Method: Approach or contact, friction

2. Demagnetization:

⑴Definition: The process of making an originally magnetic object lose its magnetism.

⑵Method: Vibrate violently (in east-west direction), high temperature treatment.

3. Soft magnets and hard magnets:

⑴Soft magnet: After the iron rod is magnetized, the magnetism easily disappears.

⑵Hard magnet: After the steel rod is magnetized, the magnetism can be preserved for a long time. (Hard magnets are also called permanent magnets)

4. Magnetic field:

1. Magnetic field: a substance that can transmit the interaction between magnetic poles.

2. The direction of the magnetic field: When the small magnetic needle is stationary in the magnetic field, the north pole of the small magnetic needle points to the direction of the magnetic field specified as that point.

3. How to describe magnetic field:

⑴ Magnetic induction lines: We imitate the arrangement of small magnetic needles in the magnetic field and draw them with some arrowed curves. Such curves are called magnetic induction lines.

⑵How to draw magnetic field lines:

⑶Characteristics of magnetic field lines:

① It is an imaginary curve and does not actually exist;

②Distributed three-dimensionally in space;

③Any two magnetic induction lines will not intersect;

④The density of magnetic field lines reflects the strength of the magnetic field;

5. Geomagnetic field:

1. Definition: The magnetic field around the earth.

2. Characteristics of the geomagnetic field:

⑴Geographic North Pole - geomagnetic South Pole;

⑵Geographic South Pole - Geomagnetic North Pole.

3. Magnetic declination - Shen Kuo, Song Dynasty, China.

6. Application and protection of magnets:

1. Application:

Various electrical appliances, computer disks, magnetic therapy and health care, maglev trains.

2. Protection:

[Experiment] What type of material can shield magnetic fields? (What material cannot a magnetic field pass through?)

Conclusion: Magnetic fields cannot pass through ferromagnetic materials.

Application: Antimagnetic watches, instruments, etc.

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For more information about the PPT courseware "Electricity and Magnetic Phenomenon and Magnetic Field", please click the Electricity and Magnetism ppt Magnetic Phenomena and Magnetic Field ppt tab.

"Magnetic Phenomena: Magnetic Field" Electricity and Magnetism PPT Courseware 6:

"Magnetic Phenomena: Magnetic Field" Electricity and Magnetism PPT Courseware 6

Learning objectives 1. Knowledge and skills: Know the concepts of magnetism, magnets, and magnetization; know the regulations of magnetic poles; know the rules of interaction between magnetic poles. (2) Know that there is a magnetic field around the magnet and that the magnetic field has directionality. Know the magnetic field lines...

"Magnetic Phenomena: Magnetic Field" Electricity and Magnetism PPT Courseware 5:

"Magnetic Phenomenon: Magnetic Field" Electricity and Magnetism PPT Courseware 5 Teaching Objectives Knowledge and Ability 1. Know the magnet's iron (cobalt, nickel) attraction and directivity. Know the magnetic poles and the interaction between them. 2. Know what magnetization is and how to magnetize it. 3. Know that there is a magnetic field around a magnet..

"Magnetic Phenomena: Magnetic Field" Electricity and Magnetism PPT Courseware 3:

"Magnetic Phenomenon and Magnetic Field" Electricity and Magnetism PPT Courseware 3 1. Magnetic Phenomenon At the beginning of the 1st century AD, Wang Chong, a scholar of the Eastern Han Dynasty, recorded in "Lunheng" that "Sinan's ladle, thrown into the ground, is a guide." The Chinese have long been Use a compass (compass) to indicate direction during navigation. 1. Magnetism ..

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Update Time: 2024-11-18

This template belongs to Physics courseware People's Education Edition Ninth Grade Physics Complete Book industry PPT template

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