"Magnetic Field" Magnetic Phenomenon PPT Courseware 6

Description

"Magnetic Field" Magnetic Phenomenon PPT Courseware 6

do you know?

1. Many birds have the ability to identify directions, among which homing pigeons are particularly outstanding. Do you know how pigeons identify directions?

2. The navigator Columbus discovered a secret about compass pointing when he first crossed the Atlantic in 1942. However, this secret was discovered by a Chinese scientist 400 years ago. What is this secret? Who was the Chinese scientist who first discovered it?

learning target

1. Understand the magnetic field, its direction and strength, and be able to use magnetic field lines to describe the magnetic field.

2. Master the relationship between the N and S poles of the geomagnetic field and the geographical North and South Poles.

Independent learning requirements:

1: Read textbook 140-142 independently and carefully to initially solve the following problems;

2: Find out the puzzle and solve it through group cooperation

1. What is a magnetic field? What are the basic properties of magnetic fields?

2. How to determine the direction and magnitude of the magnetic field? Then how to use magnetic field lines to describe the direction and strength of the magnetic field?

3. Use magnetic lines to represent the magnetic fields of a bar magnet, a hoof magnet, two magnetic poles with the same name and two magnetic poles with different names.

4. Understand the reasons for compass guidance and the relationship between the N S pole of the geomagnetic field and the geographical North and South Pole.

1. Einstein once said, “The magnetic field is as real to the physicist as the chair he sits on.” Indeed, although the magnetic field is invisible and intangible, it can exert force on the ______ placed in it. function to understand it.

2. Regarding magnetic fields, which of the following statements is incorrect ( )

A. There is a magnetic field at the two poles of the magnet, but there is no magnetic field in the middle part.

B. The magnetic field is directional

C. If the iron nail is placed in a magnetic field, if it is not magnetic originally, it will not be affected by the magnetic field force.

D. The magnetic field is distributed throughout the space around the magnet, and the strength is the same everywhere

3. Regarding magnetic flux lines, which of the following statements is correct ( )

A. The direction of the magnetic field lines is the direction of the N pole when the small magnetic needle is stationary there.

B. The closer to the magnetic poles around the magnet, the denser the magnetic field lines.

C. The magnetic field lines outside the magnet run from the north pole to the south pole.

D. Magnetic field lines are real lines

Characteristics of magnetic field lines:

1. Magnetic field lines are imaginary curves. Places where magnetic field lines are not drawn do not mean that there is no magnetic field.

2. The magnetic field lines are closed curves. The magnetic field lines outside the magnet come out from the N pole and return to the S pole, and inside the magnet they go from the S pole to the N pole.

3. The closer the magnetic field lines are to the magnetic poles, the denser the magnetic field lines are.

4. Magnetic field lines are distributed three-dimensionally, not just in one plane.

5. There are no intersecting magnetic field lines.

5. The poet Wen Tianxiang of the Southern Song Dynasty wrote in "Yangtze River" the poem "My heart is a magnetic needle stone, and it will not rest until it points to the direction." The magnetic needle stone here is because it is affected by ________, and its south pole points to the ___ of the geographical location. _pole.

6. Regarding the geomagnetic field, which of the following statements is incorrect ( )

A. The two poles of the geomagnetic field are the two geographical poles.

B. The earth itself is a large magnet, and the magnetic field around the earth is called the geomagnetic field.

C. A compass can point to north because it is affected by the geomagnetic field.

D. The poles of the geomagnetic field do not coincide with the geographical poles

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For more information about the "Magnetic Phenomenon and Magnetic Field" PPT courseware, please click on the Magnetic Phenomena ppt and Magnetic Field ppt tags.

"Magnetic Field of Current" From Compass to Maglev Train PPT Courseware 4:

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New knowledge exploration

1. Electromagnet

Definition: An energized solenoid inserted into an iron core is called an electromagnet.

Working principle: Use the magnetic effect of electric current to work.

So the magnetic size of the electromagnet is related to...

"Magnetic Field of Current" From Compass to Maglev Train PPT Courseware 3:

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Situation introduction

Are magnetism and electricity related?

magnet charged body

Can attract magnetic substances and attract light and small objects

There are North and South poles..

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Review: What is observed when a small magnetic needle is placed around a bar magnet? What is the reason?

The small magnetic needle is observed to deflect.

Reason: Because there are magnetic fields around the magnet...

File Info

Update Time: 2024-10-20

This template belongs to Physics courseware Beijing Normal University Ninth Grade Physics Volume 2 industry PPT template

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