| Category | Format | Size |
|---|---|---|
| Lu Jiao Edition Ninth Grade Physics Volume 2 | pptx | 6 MB |
"Electric Magnetism" Electromagnetic Phenomenon PPT Courseware 3
Description
"Electric Magnetism" Electromagnetic Phenomenon PPT Courseware 3
Conjecture: The connection between electricity and magnetism
What are the similarities between charged bodies and magnets?
A charged object has two kinds of charges, and a magnet has two magnetic poles. The same kind (same name) repels each other, and different kinds (different names) attract each other.
Demo 1
(1) Will the magnetic needle rotate?
As shown in the picture on the right, place a magnetic needle under a straight wire, make the wire contact the battery, connect the circuit, and observe the changes of the small magnetic needle.
The magnetic needle rotates.
(2) What does the rotation of the magnetic needle mean?
When the current is energized, the magnetic needle rotates, indicating that there is a magnetic field around the current.
This magnetic field is in a different direction than the earth's magnetic field, so the magnetic needle rotates.
Demo 2
(1) Will the magnetic needle rotate?
Change the direction of the current and observe the change of the magnetic needle.
The magnetic needle rotates in the opposite direction.
(2) What does it mean?
The direction of the magnetic field of an electric current is related to the direction of the current.
1. Magnetic effect of electric current
1. There is a magnetic field around the current, and the direction of the magnetic field of the current is related to the direction of the current.
2. There is a magnetic field around a current-carrying wire that is related to the direction of the current. This phenomenon is called the magnetic effect of current.
2. Magnetic field of energized solenoid
1. Wrap a wire around a cylinder to make a solenoid (also called a coil). After energization, the magnetic fields of each circle of wires are superimposed and the magnetic field is enhanced.
Experimental conclusion: The external magnetic field of the energized solenoid is similar to the magnetic field of the bar magnet; the polarity at both ends of the energized solenoid is related to the direction of the current.
3. Ampere’s Rule
Hold the solenoid with your right hand and let your four fingers point in the direction of the current in the solenoid. The end pointed by your thumb is the N pole of the solenoid.
practice
1. Determine the N and S poles in the solenoid below:
2. Determine the direction of current in a solenoid:
3. According to the direction of the small magnetic needle when it is stationary, the positive and negative poles of the power supply can be determined.
Keywords: electromagnetic phenomenon teaching courseware, electromagnetic teaching courseware, Shandong Education Edition ninth grade physics PPT courseware download, ninth grade physics slide courseware download, electromagnetic phenomenon PPT courseware download, electromagnetic PPT courseware download, .PPT format ;
For more information about the PPT courseware "Electromagnetism and Electromagnetic Phenomenon", please click on the Electromagnetic Phenomenon ppt tab.
"Electric Magnetism" PPT:
"Electric Magnetism" PPT Part One Content: Oersted's Experiment In 1820, Danish physicist Oersted finally experimentally confirmed the existence of a magnetic field around an energized conductor. This major discovery shocked the scientific community and brought electromagnetism into a new era. period of development. The magnetic field of the current...
"Electric Magnetism" Electromagnetic Phenomenon PPT Courseware 2:
"Electric Magnetism" Electromagnetic Phenomenon PPT Courseware 2 Practice 1. An iron block is hung under the spring dynamometer. When the spring dynamometer is moved from N to S, the indication of the spring dynamometer changes with the position. The image is 2． There are two rods a and b with the same shape. If it is as shown in Figure A...
"Electric Magnetism" electromagnetic phenomenon PPT courseware:
"Electric Magnetism" Electromagnetic Phenomenon PPT Courseware (1) Will the magnetic needle rotate? As shown in the picture on the right, place a magnetic needle under a straight wire, make the wire contact the battery, connect the circuit, and observe the changes of the small magnetic needle. The magnetic needle rotates. (2) What does the rotation of the magnetic needle mean...
File Info
Update Time: 2024-07-27
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