"Magnetic Field" Magnetic Phenomenon PPT Courseware 5

Description

"Magnetic Field" Magnetic Phenomenon PPT Courseware 5

Import question 1:

1. Many birds have the ability to identify directions, among which homing pigeons are particularly outstanding. But scientists did an experiment: they tied magnets to many pigeons. As a result, after they flew into the sky on a cloudy day, they appeared extremely panicked and flew away in all directions, unable to return home. In contrast to these pigeons, other pigeons were tied with copper rods, and this group of pigeons returned home safely. Why is this? How do pigeons identify directions?

Import question 2:

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?

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.

Magnetic fields and magnetic field lines

magnetic field

objective existence.

The direction in which the N pole points when the small magnetic needle is stationary at a certain point in the magnetic field.

The closer to the pole outside the magnet, the stronger the magnetic field.

Magnetic field lines

does not exist.

From the N pole to the S pole outside the magnet, the tangent direction of a point on the magnetic field line represents the direction of the magnetic field at that point.

The closer to the magnetic pole outside the magnet, the denser the magnetic field lines. The denser the magnetic field lines, the stronger the magnetic field.

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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:

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

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:

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

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..

"Magnetic Field of Current" From Compass to Maglev Train PPT Courseware 2:

"Magnetic Field of Current" From Compass to Maglev Train PPT Courseware 2

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: 2024-11-20

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

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