"Magnetic Field of Electric Current" Magnetic Phenomenon PPT Courseware 3

Description

"Magnetic Field of Electric Current" Magnetic Phenomenon PPT Courseware 3

1. The relationship between magnetism and electricity

1. They all use magnets, but these magnets are inseparable from electricity. What is the relationship between magnetism and electricity?

2. Charged bodies and magnets have some similar properties (such as the law of interaction between charges and the law of interaction between magnetic poles). Are these similarities a coincidence, or are there internal connections? In 1820, Danish physicist Oersted accidentally discovered...

2. Oersted’s experiment

1. Experiment

2. Phenomenon and conclusion:

When the circuit is turned on, current flows through the wire, and the small magnetic needle deflects;

When the circuit is disconnected, no current flows through the wire and the small magnetic needle does not deflect.

Shows: There is a magnetic field around a current-carrying conductor. (experimental research)

3. The direction of the magnetic field around a current-carrying conductor is related to the direction of the current.

3. Magnetic field of energized solenoid

1. Experiment

2. Analysis: There are ______ around the energized solenoid;

The N pole of the small magnetic needle at end a is ______;

The S pole of the small magnetic needle at end b is ______.

Explanation: The a-side of the energized solenoid is _____; the b-side of the energized solenoid is _____.

3. Experimental conclusion:

⑴The distribution of iron filings around the energized solenoid is similar to the distribution of iron filings around the bar magnet. Therefore, the magnetic field around it is similar to the magnetic field around the bar magnet.

Therefore: the energized solenoid is equivalent to a bar magnet externally.

⑵The polarity of the two ends of the energized solenoid is related to the direction of the current in the solenoid.

4. Judgment of magnetic poles of energized solenoid → Right-hand Ampere’s rule

⑴ Stretch out your right hand,

The thumb and fingers are on the same plane,

The thumb and fingers are vertical,

Hold the solenoid,

⑵The direction of the four fingers is the direction of current.

The end pointed by the thumb is the N pole of the energized solenoid.

5. Exercise:

1. Mark the N and S poles of the solenoid.

2. Mark the direction of the current in the solenoid.

3. According to the conditions given in the figure, draw the winding method of the solenoid.

6. Summary:

1. Electric current has a magnetic effect; (Example: electromagnetic crane)

2. There is a magnetic field around the current, and the direction of the magnetic field is related to the direction of the current.

3． An energized solenoid acts like a magnet to the outside. Determine the magnetic poles of the energized solenoid and the direction of the current in the energized solenoid according to the right-hand spiral rule.

Keywords: Magnetic phenomena teaching courseware, Current magnetic field teaching courseware, Beijing Normal University version ninth grade physics PPT courseware download, Volume 2, Ninth grade physics slide courseware download, Magnetic phenomena PPT courseware download, Current magnetic field PPT courseware download, .PPT Format;

For more information about the PPT courseware "Magnetic Phenomena and Current's Magnetic Field", please click on the Magnetic Phenomena ppt Current's Magnetic Field ppt tag.

"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...

File Info

Update Time: 2024-07-29

This template belongs to Physics courseware Beijing Normal University Ninth Grade Physics Volume 2 industry PPT template

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