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"Magnetic Phenomena: Magnetic Field" Electricity and Magnetism PPT Courseware 3
1. Magnetic phenomena
At the beginning of the 1st century AD, Wang Chong, a scholar of the Eastern Han Dynasty, recorded in "Lunheng" that "Sinan's ladle was thrown to the ground and its guide was used."
The Chinese have long used compasses (compasses) to indicate direction during navigation.
1. Magnetism: The property of attracting iron, cobalt, nickel and other substances.
2. Magnet: A magnetic object.
Bar shape, needle shape, hoof shape, cylindrical shape
3. The two parts of the magnet with the strongest attraction ability are called magnetic poles.
(Each magnet has two poles)
For a magnet that can rotate freely, the magnetic pole that points to the north when it is stationary is called the south pole or S pole, and the magnetic pole that points to the north is called the north pole or N pole.
practise
1. The property of objects that can attract iron-containing objects is called _______. Objects with this property are called ______
2. The strongest magnetic part of a magnet is _______. This part is called _________, which are called ____ pole and ____ pole respectively.
3. Tie a thin wire to the middle of a bar magnet and hang it in still air. You can find that the bar magnet always points in the ________ direction. The N pole of the bar magnet refers to ______ and the S pole refers to _______.
Place several small magnetic needles in different places around the bar magnet.
(1) Do the magnetic needles point in the same direction?
(2) Are the directions of the magnetic forces on the small magnetic needles the same?
(3) What properties of the magnetic field does this phenomenon reflect?
practice
1. Mark the names of the magnetic poles and the directions of the magnetic fields at points A and B.
2. The correct statement about magnetic field lines is ( )
A. Magnetic field lines are formed by small iron filings
B． There are many curves in the magnetic field, these curves are called magnetic field lines
C. The small magnetic needle only experiences force on the magnetic field lines and does not receive force between the two magnetic field lines.
D. Magnetic field lines are imaginary by people in order to vividly describe the distribution of magnetic fields. They do not actually exist.
3. Geomagnetic field
The rotation of the magnetic needle is the result of the action of the magnetic field. So compasses can guide north and south all over the world, but whose magnetic field is exerting the action?
1. The magnetic field that exists around the earth is called the geomagnetic field.
2. Studies have shown that the geomagnetic field has a shape similar to that of a bar magnet.
3. Geomagnetic field characteristics
The geomagnetic N pole is near the geographical South Pole;
The geomagnetic S pole is near the geographical North Pole.
The geographical poles are opposite to the geomagnetic poles and do not exactly coincide.
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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 4:
"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 magnets, artificial magnets, permanent magnets, natural...