"Magnetic Field of Current" Magnetic Phenomenon PPT Courseware 4

Description

"Magnetic Field of Current" Magnetic Phenomenon PPT Courseware 4

Review: What is observed when a bar magnet is placed around a small magnetic needle? What is the reason?

Experiment: A small magnetic needle was observed to deflect.

Reason: Because there is a magnetic field around the magnet, the small magnetic needle is deflected by the magnetic force of the magnetic field.

Question: Will the small magnetic needle be deflected by the magnetic force only when it is placed around a magnet?

In other words, is there only a magnetic field around the magnet? Can other substances produce magnetic fields?

1. Oersted’s experiment

1. Demonstration experiment

Exploring the magnetic field around a straight current-carrying wire

Comparing A and B, the small magnetic needle deflects when there is current in the wire, but does not deflect when there is no current.

Explanation: There is a magnetic field around the current-carrying wire!

Comparing A and C, the direction of the current has changed, and the direction of the small magnetic needle has changed.

Explanation: The direction of the magnetic field around a current-carrying wire is related to the direction of the current!

2. Magnetic field of energized solenoid

1. Demonstration experiment 1

2. Analysis

The phenomenon shows that there is a magnetic field around the energized solenoid

The N pole of the small magnetic needle at the right end is attracted;

The S pole of the small magnetic needle at the left end is attracted.

Note: The right end of the energized solenoid is the S pole;

The left end of the energized solenoid is the N pole.

in conclusion:

1. There is a magnetic field around the energized solenoid;

2. The magnetic field distribution of the energized solenoid is similar to that of the bar magnet;

3. The polarity of the energized solenoid depends on the direction of the current.

Ampere's rule:

Hold the solenoid with your right hand and bend your four fingers toward the direction of the current in the solenoid. The end pointed by your thumb is the north pole of the solenoid.

Method and sequence of using Ampere's rule:

(1) Check the winding direction of the solenoid;

(2) Mark the direction of current in the solenoid;

(3) Use Ampere’s rule to determine the magnetic pole direction of the solenoid

summary

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

2. 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.

Class exercises

1. Use the right-hand screw rule to determine the N and S poles of the following solenoids.

2. Mark the current direction of the solenoid and the positive and negative poles of the power supply as shown in the figure.

3. Practice drawing the winding of the solenoid (winding according to the example)

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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: 2024-09-08

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

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