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Authoritative PPT Summary
"Simple Magnetic Phenomenon" Magnetic Phenomenon PPT Courseware 4
1. Magnetism: The property of objects that can attract iron, cobalt, nickel and other substances is called magnetism.
Magnet: A magnetic object is called a magnet.
2. Determination of the direction of the magnetic field
It is stipulated in physics that at any point in the magnetic field, the direction in which the north pole of the small magnetic needle is exerted, that is, the direction the north pole points when it is stationary, is the direction of the magnetic field at that point.
3. Magnetic induction lines
1. “Simulation display” of magnetic field lines
2. Concept of magnetic field lines:
Draw some directional curves in the magnetic field. On these curves, the tangent direction of each point is consistent with the direction of the magnetic field at that point. The density of the magnetic field lines reflects the strength of the magnetic field at that point.
3. Distribution of magnetic field lines of various magnetic fields
Bar magnet, hoof magnet, geomagnetic field
Characteristics of magnetic field lines:
1. Outside the magnet, the magnetic field lines run from the N pole to the S pole, and inside the magnet they go from the S pole to the N pole.
2. Each magnetic field line is a closed curve, does not intersect or interrupt.
3. Where the magnetic field is strong, the magnetic field lines are denser, and vice versa.
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.
Capability innovation
1. As shown in the figure, two identical cars A and B are placed on a smooth surface, and a bar magnet is placed on them respectively, then ( )
A. Car A does not move, car B moves in the direction of car A;
B. Car B does not move, car A moves in the direction of car B;
C. Cars A and B move in opposite directions at the same time;
D. Cars A and B do not move.
Correct answer: C
2. Put one end of a steel rod close to the north pole of the small magnetic needle. As a result, the magnetic needle moves closer to the steel rod. From this, it can be judged ( )
A. The steel rod must be magnetic originally, and the end close to the magnetic needle is the north pole;
B. The steel rod must be magnetic originally, and the end close to the magnetic needle is the south pole;
C. The steel rod must not be magnetic;
D. The steel rod may not be magnetic originally; it may also be magnetic and the end close to the magnetic needle is the south pole;
Correct answer: D
3. If the two pins are picked up by the bar magnet, then the other ends of the two pins will ( )
A. Mutually exclusive;
B. Attract each other;
C. Neither attract nor repel each other;
D. Unable to judge.
Correct answer: A
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