"Electricity Generates Magnetism" Electricity and Magnetism PPT Courseware 5

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"Electricity Generates Magnetism" Electricity and Magnetism PPT Courseware 5

review:

1. How to tell whether an object is magnetic?

2. There is a magnetic field around the magnet. The basic property of the magnetic field is to produce ____ on the magnet placed inside it.

3. What is the direction of the magnetic field outside the bar magnet?

Group exploration:

1. Question: Can electric current really produce a magnetic field?

2.How do you do it? What did you see? What does it mean?

3. When the direction of the current is changed, does the deflection direction of the small magnetic needle change? What does this mean?

Analysis and argumentation:

When power is applied, the small magnetic needle ____ deflects (fill in yes or no);

The small magnetic needle ____ when the power is off;

illustrate:____.

The direction of the energizing current is opposite, and the small magnetic needle deflects in the direction ____.

illustrate:____________.

3. Conclusion: 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.

4. The significance of Oersted's experiment: This experiment seems very simple, but this major discovery caused a sensation in the scientific community at the time, because it revealed that electrical phenomena and magnetic phenomena are not isolated from each other, but are closely connected, thus explaining that Natural phenomena that are seemingly unrelated to each other are interconnected. He was the first in the world to link two different phenomena, electrical and magnetic, together. This discovery effectively promoted the research and development of electromagnetism.

2. Magnetic field of energized spiral tube

1. Understand the solenoid (also called a coil): A wire wound around an insulating cylinder is called a spiral tube, also called a coil.

2. Experiment: Explore the magnetic field of a energized solenoid

Exploration 1: Use energized wires and energized solenoids to attract iron filings respectively, and see which group attracts more iron filings.

What you found: The magnetism of the current-carrying solenoid is ____ greater than the magnetism of the current-carrying wire.

Research 2: Place one end of the energized solenoid close to the south and north poles of the small magnetic needle to see what happens? Try again with the other end of the energized solenoid.

What you discovered: One end attracts, the other repels

Exploration 3: The distribution of the external magnetic field of the energized solenoid.

Question 1: The magnetic field outside an energized solenoid might be similar to the magnetic field of what magnet?

Question 2: Is the polarity of the energized solenoid related to the direction of the current?

Friendly reminder: You can refer to the steps of the experiment "Exploring the distribution of the external magnetic field of the energized solenoid" on page 125 of the textbook, and record the direction of the current and the direction of the N pole of the small magnetic needle at any time.

3. Ampere’s Rule

The relationship between the polarity of the energized spiral tube and the direction of the current

1. 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 North Pole (N pole) of the energized solenoid. This is called Ampere's rule.

What you gain:

(1) Oersted’s experiment:

1. There is a magnetic field around a current-carrying conductor.

2. The direction of the current magnetic field is related to the direction of the current.

(ii) Magnetic field of energized solenoid

1. The direction of the magnetic field of the energized solenoid is related to the direction of the current and the winding method of the wire.

2. Ampere's rule: Hold the solenoid with your right hand and bend your four fingers in the direction of the solenoid current. The end pointed by your thumb is the north pole of the energized solenoid.

after class homework

1. This section is "Learn Physics with Your Hands and Brain".

2. “I want to discuss” on page 127 of the textbook.

3. If the magnetism of a bar magnet weakens, can you use an electric current to make it stronger? What should I do?

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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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