"Magnetic Phenomenon" Electromagnetic Phenomenon PPT Courseware 2

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"Magnetic Phenomenon" Electromagnetic Phenomenon PPT Courseware 2

1. Simple magnetic phenomena

1. Magnetism:

The property of objects to attract iron, cobalt, nickel and other substances is called magnetism

2. Magnet:

Magnetic objects are called magnets.

Magnets are divided into: natural magnets and artificial magnets

Three: Magnetic pole

The strongest magnetic part of a magnet is called the magnetic pole. Any magnet has two magnetic poles, called the south pole and the north pole.

4. The law of interaction between magnetic poles is:

Magnetic poles with the same name repel each other,

Magnetic poles with different names attract each other

5. Magnetization: The process by which a non-magnetic object acquires magnetism is called magnetization.

After the iron rod is magnetized, its magnetism easily disappears and it is called a soft magnet.

After steel is magnetized, its magnetism can be maintained for a long time and is called a hard magnet or permanent magnet. Steel is a good material for making permanent magnets.

1. Magnetism: The property that can attract _______________ is called magnetism.

2. Magnet: _______________ object.

Magnet classification:

① Soft magnets and hard magnets (permanent magnets) according to the magnetic retention time ② Artificial magnets and natural magnets

3. Magnetic pole: the _______________ part of the magnet.

The magnet has two magnetic poles, called the south pole (S pole) and the north pole (N pole).

The law of action of magnetic poles: _______________.

4. Magnetization refers to: ____________________

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. The process of making a non-magnetic object acquire magnetism is called _______. If soft iron rods and steel rods are magnetic, then the ones that can maintain magnetism for a long time are _____ rods, and the ones that cannot maintain magnetism for a long time are ______ rods (in without the influence of other objects).

4. As shown in the picture, two pins are sucked up by the bar magnet. The correct picture is ( )

5. Use one end of the magnet to approach the small iron nail. If the small iron nail is repelled, then ( )

A. Iron nails must be magnetic

B. Iron nails are definitely not magnetic

C. Iron nails may be magnetic

D. None of the above statements are correct

Classroom exercises

1. Regarding magnetic field lines, which of the following statements is correct ( )

A. Magnetic field lines are curves that actually exist in a magnetic field

B． The magnetic field lines around the magnet all come out from the north pole of the magnet and return to the south pole of the magnet.

C. The direction of the magnetic force exerted by the south pole of the small magnetic needle at a certain point is the same as the direction of the magnetic field lines at that point.

D． Magnetic field lines are only distributed outside the magnet, not inside the magnet

2. First place a circle of small magnetic needles on the table, and then place a bar magnet in the middle of the circle. It is observed that the direction of the small magnetic needle changes. This fact indicates ( ).

A. Magnets can magnetize other objects

B． The magnet itself has a direction

C. There is a magnetic field around a magnet

D． The above three statements are incorrect

4. Regarding magnetic field lines, which of the following statements is correct ( ).

A. Magnetic field lines have north and south poles

B． When the small magnetic needle is at rest in the magnetic field, the south pole always points in the opposite direction to the magnetic field lines.

C. Magnetic field lines are real lines in the magnetic field

D． Magnetic lines are curved lines

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Update Time: 2024-11-22

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