"Magnetic Field of Current" From Compass to Maglev Train PPT Courseware 2

Description

"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 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. The relationship between magnetism and electricity

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

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

3. Magnetic field of energized solenoid

Judgment of magnetic poles of energized solenoid

Stretch out your right hand,

The thumb and fingers are on the same plane,

The thumb and fingers are vertical,

Hold the solenoid,

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

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

practise

1. Mark the N and S poles of the solenoid

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

3. Mark the positive and negative poles of the power supply (the small magnetic needle in the picture is stationary)

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.

Operation

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

2. As shown in the figure, indicate the current direction of the solenoid and the positive and negative poles of the power supply.

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

Experimental results

1. The electromagnet is magnetic when energized and non-magnetic when powered off.

2. The greater the current flowing into the electromagnet, the stronger its magnetism.

3. When the current is constant, for a solenoid with the same shape, the more turns the coil has, the stronger its magnetism will be.

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For more information about the PPT courseware "From Compass to Maglev Train Current's Magnetic Field", please click the From Compass to Maglev Train's 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:

"Magnetic Field of Current" From Compass to Maglev Train PPT Courseware

1. Oersted’s experiment

1. Place a wire parallel to the small magnetic needle. When the circuit wire is connected, the current passes through the small magnetic needle. When the circuit wire is disconnected, the current passes through the small magnetic needle.

File Info

Update Time: 2024-09-08

This template belongs to Physics courseware Shanghai Science Edition Ninth Grade Physics industry PPT template

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