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"Magnetic Field" Magnetic Phenomenon PPT Courseware 4
Introduction
In 843 AD, on the vast sea where water and sky were the same color, a sailboat was sailing day and night with no navigation mark and no clear channel. Some smart Chinese people on the ship used the directions indicated by the instruments in their hands to open a route from Wenzhou, Zhejiang, to Japan's Kashin Island. Do you know what this amazing instrument is?
1. Magnetic phenomena:
1. Magnet: A substance that can attract iron, cobalt, nickel, etc.
2. Magnetic poles: The strongest magnetic part of the magnet - the magnet has two magnetic poles, called the south pole (S) and the north pole (N).
3. The role of magnetic poles: Magnetic poles with the same name repel each other; magnetic poles with different names attract each other.
2. Magnetic field:
A magnetic field exists around a magnet.
Basic properties of magnetic fields: The force exerted by a magnetic field on a magnet placed within it.
The magnetic field has a direction: the direction pointed by the north pole when the small magnetic needle is stationary is the direction of the magnetic field at that point.
3. Magnetic induction lines:
Definition: Draw a curve with an arrow in the direction pointed by the N pole of the small magnetic needle. Such a curve is called a magnetic field line.
The distribution regularity of magnetic field lines: they come out from the N pole of the magnet and end at the S pole.
4. Geomagnetic field:
Geomagnetic field: There is a magnetic field surrounding the earth.
Magnetic poles: The geomagnetic north pole is near the geographical south pole; the geomagnetic south pole is near the geographical north pole.
5. Magnetization:
Some objects acquire magnetism under the action of a magnetic field or electric current. This phenomenon is called magnetization.
Magnetization has advantages and disadvantages.
6. What have you learned?
1. Magnet: A substance that can attract iron, cobalt, nickel, etc.
2. Magnetic poles: The strongest magnetic part of the magnet - the magnet has two magnetic poles, called the south pole (S) and the north pole (N).
3. The role of magnetic poles: Magnetic poles with the same name repel each other; magnetic poles with different names attract each other.
4. A magnetic field exists around the magnet.
5. The basic properties of the magnetic field: the force exerted by the magnetic field on the magnet placed in it.
6. The magnetic field has a direction: the direction pointed by the north pole when the small magnetic needle is stationary is the direction of the magnetic field.
7. Draw a curve with an arrow in the direction pointed by the N pole of the small magnetic needle. Such a curve is called a magnetic field line.
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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...