"Electric Magnetism" Electricity and Magnetism PPT Courseware

Description

"Electric Magnetism" Electricity and Magnetism PPT Courseware

1. Magnetic effect of electric current

1. There is a magnetic field around a current-carrying wire, and the direction of the magnetic field is related to the direction of the current. This phenomenon is called the magnetic effect of current.

This phenomenon was first discovered by the Danish physicist Oersted, so this experiment became the Oersted experiment.

Oster's story

Oersted was a Danish physicist. He was smart and studious since he was a child. In 1794, he was admitted to the University of Copenhagen with excellent results and later became a physics professor at the university.

He believed in the connections between various natural phenomena. After a long search with experiments, and after many failures, in 1820, Oersted discovered the connection between electricity and magnetism while conducting experiments in class.

2. Magnetic field of energized solenoid

Since electricity creates magnetism, why can't a current-carrying wire attract even a paper clip needle?

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.

Explore the magnetic field distribution outside the energized solenoid

Demonstration: Place a small magnetic needle at each end of the solenoid and sprinkle iron filings evenly on the cardboard. After powering on, observe the pointing of the pointer, tap the cardboard, and observe the arrangement of the iron filings.

Changing the direction of the current reverses the direction of the small magnetic needles on both sides.

Experimental results:

The magnetic field outside the energized solenoid is the same as that of the bar magnet.

The polarity at the ends of an energized solenoid is related to the direction of current flowing through it.

How to determine the relationship between the polarity of an energized solenoid and the direction of current flow?

3. Ampere’s rule (right-hand spiral 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.

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For more information about the PPT courseware "Electric Magnetism, Electricity and Magnetism", please click on the Electricity and Magnetism 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 3:

"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)..

"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...

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Update Time: 2024-07-27

This template belongs to Physics courseware People's Education Edition Ninth Grade Physics Complete Book industry PPT template

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