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"What is Magnetism" From Compass to Maglev Train PPT Courseware
1. The wonderful use of magnets
1. Basic knowledge of magnetism
(1) Magnetic poles: The strongest magnetic part on a magnet. Any magnet has ______ magnetic poles, which are called ______, ______ (______). There is no magnet with only a single pole.
(2) The law of interaction between magnetic poles: ____________.
(3) Magnetization: The process of ______ when ferromagnetic substances (iron, cobalt, nickel, etc.) are in contact with or close to the magnetic poles of magnets is called magnetization.
(4) The earth is a large natural magnet.
2. Applications of magnetism: (give two examples) ______, ______.
2. What is around the magnet?
Scientific research shows that there is indeed a substance around the magnet, which is named "______" in physics.
3. Magnetic induction lines - a method of describing magnetic fields
Magnetic induction lines: In order to describe the magnetic field visually and intuitively, magnetic induction lines are introduced in physics, that is, ____________ is used to describe certain characteristics and properties of the magnetic field, referred to as _______. On the outside of a magnet, magnetic field lines always originate from the _______ of the magnet and finally return to _______. Where the magnetic field lines are more densely distributed, the magnetic field is more ________; where the magnetic field lines are sparser, the magnetic field is more ________.
1. Basic knowledge of magnetism
(1) The magnet has iron attraction and directivity (in the north-south direction after free rest). (2) Magnetic pole: the strongest magnetic part of the magnet. The magnetic poles of a bar magnet are at both ends, with the weakest magnetism in the middle. (3) The law of interaction between magnetic poles: magnetic poles with the same name repel each other, and magnetic poles with different names attract each other. (4) Magnetization: The process of making iron, cobalt, nickel and other substances that are originally non-magnetic acquire magnetism.
2. Magnetic field and magnetic induction lines
(1) Magnetic field: ① Exists around the magnet. The magnetic field is strong near the magnetic pole and weak away from the magnet. ②Produces magnetic force on the magnet placed inside. ③ Direction: In physics, the direction of the North Pole when the small magnetic needle is free and stationary at a certain point in the magnetic field is defined as the direction of the magnetic field at that point.
(2) Magnetic induction lines: ① An idealized model imagined by people to describe the direction and distribution of the magnetic field intuitively and vividly. It is not a curve that actually exists in a magnetic field. ② Features: The magnetic induction lines around the magnet start from the N pole and return to the S pole, and inside they start from the S pole and return to the N pole; the tangent direction of any point on the magnetic induction line is affected by the north pole of the small magnetic needle placed at that point. The direction of the force is consistent; the magnetic induction lines are closed curves, which will not be interrupted or intersect; the density of the distribution of the magnetic induction lines can reflect the strength of the magnetic field. The denser, the stronger, and vice versa. ③The distribution of magnetic induction lines in space is not plane but three-dimensional, but it is usually only drawn on a plane, and only a few representative lines are drawn.
1. The geological prospecting team discovered that the geomagnetic field in an area covering an area of tens of thousands of square kilometers in East China is very abnormal. There may be considerable () underground in this area.
A.Copper B.Iron
C. Aluminum D. Silver
2. As shown in the figure, a bar magnet has an S pole on the left end and an N pole on the right end. The picture below is an image describing the change in magnetic strength from the S pole to the N pole. The correct one is ()
3. The compass is one of the four great inventions in ancient my country. A compass can guide north because the _______ compass is affected by _______.
Knowledge point 2: Magnetic field and magnetic field lines
4. Regarding the knowledge of magnetic fields, which of the following statements is correct ()
A. Magnetic field lines are some real curves in the magnetic field
B. The process by which a non-magnetic object acquires magnetism is called magnetization
C. The magnetic field lines around the magnet come out from the S pole of the magnet and return to the N pole of the magnet.
D. Not all interactions between magnetic poles occur through magnetic fields
5. (Double choice) Regarding magnetic field lines, which of the following statements is correct ()
A. The tangent direction of any point on the magnetic field line is the direction of the magnetic field at that point
B. The magnetic field lines outside the magnet all come out from the N pole of the magnet and return to the S pole.
C. The magnetic field lines in the magnetic field are real.
D. Magnetic field lines are made of iron filings
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"What is Magnetism" From Compass to Maglev Train PPT Courseware 3:
"What is Magnetism" From Compass to Maglev Train PPT Courseware 3 New Knowledge Exploration 1. Magnetic Phenomenon 1. Magnets and Magnetism Design experimental verification: Conclusion 1: Magnets can attract iron, cobalt, nickel and objects containing these substances. Magnetism: Magnets have the ability to attract iron, cobalt, and nickel..
"What is Magnetism" From Compass to Maglev Train PPT Courseware 2:
"What is Magnetism" From Compass to Maglev Train PPT Courseware 2 Know the properties of magnets: iron attraction and directivity. Be able to determine whether an object is magnetic and the magnetic poles of a magnet, and understand the concept of magnetization. Know that magnetic poles with the same name repel each other and magnetic poles with different names attract each other...