Guangdong and Shanghai Edition Ninth Grade Physics Volume 2

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"Oersted's Discovery" Electromagnet and Automatic Control PPT Courseware 2

Similarities between Electrical and Magnetic Phenomena

electrical phenomenon

Electrically charged objects attract ________.

There are ___charges and ____charges in nature

Like charges ____ each other, and dissimilar charges ____ each other.

magnetic phenomena

Magnets can attract substances such as ________

There are ____ poles and ____ poles on the magnet.

Magnetic poles with the same name ___ each other, and magnetic poles with different names ___ each other.

Oersted experiment

Place the straight wire parallel to the small magnetic needle and place the wire over the small magnetic needle.

Observe carefully with the following questions:

1. What happens when a straight wire is energized?

2. What happens after a power outage?

3． What happens when the direction of the current is changed?

observed physical phenomena

When electricity is applied, the small magnetic needle ______;

The small magnetic needle _______________ when the power is off;

Conclusion: _____ exists around energized wires;

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

Conclusion: The direction of the magnetic field is related to ___________..

induction

There are ____ around the current-carrying wire, and the direction of the magnetic field of the current is related to the direction of ______. The magnetic field of the current indicates that the current has the ____ effect.

practise

1. The first scientist to discover the connection between electricity and magnetism was ( )

A. Oersted B. Faraday

C. Coulomb D. Ampere

2. A student uses the device shown in the picture below to study the connection between electricity and magnetism. Please carefully observe the device\operation and phenomenon in the picture, and then draw a preliminary conclusion.

Comparing Figures A and B, we can see that there is a magnetic field around the current

Comparing Figures B and C, we can see that the direction of the magnetic field around the current is related to the direction of the current.

Magnetic field of energized solenoid

Place some small magnetic needles around the solenoid, and after powering on, observe the arrangement of the iron filings and the direction of the small magnetic needles. Change the direction of the current and observe again.

1. After power is applied, the arrangement of the small magnetic needles is the same as that of what magnet?

Its arrangement is the same as that of bar magnets, and the energized solenoid is equivalent to bar magnets.

2. How does the small magnetic needle point before power is turned on, and what happens after power is turned on?

It turns out that the small magnetic needle points to north, but when electricity is applied, the magnetic needle deflects.

3. When the direction of electricity is changed, what is the difference in the direction of the small magnetic needle? What does it mean?

The small magnetic needle points in the opposite direction, indicating that the polarity of the two ends of the energized solenoid is related to the energized current.

induction

(1) The magnetic field around an energized solenoid is similar to a ______ magnet.

(2) The ____ end of the energized solenoid has the strongest magnetism.

(3) The magnetic pole properties of the energized solenoid are related to the ______ direction.

The right-hand spiral rule can solve the following problems:

1. Give the current direction and determine the N and S poles.

2. Given the N and S poles of the small magnetic needle, determine the N and S poles of the energized solenoid, the direction of the magnetic field lines and the direction of the current.

3. Give the current direction and the N and S poles of the solenoid, and draw the winding method of the solenoid.

Class tracking feedback

1. There are ____ around the magnet, and the magnetic field is an objectively existing _____.

2. The basic property of the magnetic field is that it has a ___ effect on the magnets placed in it. The interaction between the magnetic poles occurs through _____. Although the magnetic field is invisible and intangible, we can use _____ to describe it. its existence.

3. The magnetism of a bar magnet is _____ the strongest and ____ the weakest. Outside the magnet, the magnetic field lines come out from ____ and return to the _____ of the magnet.

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"Oersted's Discovery" Electromagnets and Automatic Control PPT Courseware 3:

"Oersted's Discovery" Electromagnets and Automatic Control PPT Courseware 3 Oersted Experiment Conclusion: 1. There is a magnetic field around the energized wire; 2. The direction of the magnetic field of the current is related to the direction of the current. This phenomenon is called the magnetic effect of electric current. Oersted's experiment shows that: 1. Electric conduction...

"Oersted's Discovery" Electromagnets and Automatic Control PPT courseware:

"Oersted's Discovery" Electromagnets and Automatic Control PPT Courseware Reviewing the Past and Learning the New 1. There is a _______ magnetic field around the magnet, which is an objectively existing ______ magnetic field. When a small magnetic needle is placed at one point and comes to rest, its ____ pole points to The direction of is the direction of the magnetic field at that point. 2,..

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Update Time: 2024-11-22

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