"The force of a magnetic field on a current-carrying wire" Magnetic Phenomena PPT courseware

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"The force of a magnetic field on a current-carrying wire" Magnetic Phenomena PPT courseware

think about it

In Oersted's experiment, we know that the current has a powerful effect on the magnet. On the contrary, what about the powerless effect of the magnet on the current?

1. The effect of magnetic field on current-carrying wires

Observe and think

1. Device

2. Experiment

Step ①: Close the switch

Phenomenon ①: The straight wire moves

Conclusion ①: The magnetic field has a powerful effect on the current-carrying wire.

Step ②: Change the direction of current

Phenomenon ②: The direction of wire movement changes

Conclusion ②: The direction of the force of the magnetic field on the current-carrying wire is related to the direction of the current

Step ③: Change the direction of the magnetic field

Phenomenon ③: The direction of wire movement changes

Conclusion ③: The direction of the force exerted by the magnetic field on the current-carrying wire is related to the direction of the magnetic field.

Experiment summary

1. When the switch is closed, the conductor that was originally stationary in the magnetic field moves. The motion state of the conductor changes, indicating that the magnetic field has a powerful effect on the energized conductor.

2. If the direction of the magnetic field remains unchanged and the direction of the current is changed, the direction of motion of the conductor in the magnetic field will change. This shows that the change in the direction of the current causes the direction of the force on the conductor to change.

3. If the direction of the current remains unchanged and the direction of the magnetic field is changed, the direction of motion of the conductor in the magnetic field will change. This shows that the change in ________ causes the direction of the force on the conductor to change.

4. If the direction of the magnetic field and the direction of the current are changed at the same time, the direction of movement of the conductor in the magnetic field will change _________.

2. Left-hand rule

Stretch out your left hand, put the four fingers together, and make the thumb perpendicular to the four fingers and in the same plane. Let the magnetic induction lines pass through the palm of your hand vertically and make the four fingers point in the direction of the current. At this time, the direction pointed by the thumb is the direction of the current-carrying wire in the magnetic field. The direction of the magnetic field force.

3. Moving coil speakers

1. Composition: three main parts: voice coil, permanent magnet, and cone.

2. Working principle: When current passes through the voice coil, it will be affected by the magnetic field force and move. Since the current passing through the voice coil changes repeatedly when the speaker is working, the voice coil has to reciprocate back and forth, which drives the paper cone to vibrate back and forth, producing sound.

Exercise: As shown in the figure, conduct an experiment on the force movement of a energized wire in a magnetic field, and answer the following questions:

(1) Place the wire in the magnetic field, turn on the power supply, and let the current pass through the wire ab. You will find that the wire ab______;

(2) Swap the positive and negative poles of the power supply and connect it to the circuit so that the direction of the current through the wire is opposite to the original one. At this time, the wire ab______;

(3) Keep the positive and negative poles of the power supply unchanged, and reverse the magnetic poles of the magnet so that the direction of the magnetic field is opposite to the original. At this time, the wire ab______. From this it can be concluded that the energized wire will be acted upon by a force in the magnetic field, and the direction of the force is related to both the direction of ______ and the direction of ______.

summary

1. The effect of magnetic field on energized conductors

2. Left-hand rule

3. Moving coil speakers

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For more information about the PPT courseware "Magnetic Phenomenon: The Force Acting on a Current-carrying Wire by a Magnetic Field", please click on the "Magnetic Phenomenon ppt: The Force Acting on a Current-carrying Wire" ppt tag.

"The force of the magnetic field on the current-carrying wire" Magnetic Phenomenon PPT Courseware 2:

"The Force of the Magnetic Field on the Electrified Wire" Magnetic Phenomenon PPT Courseware 2 Experience the Effect of the Magnetic Field on the Electrified Straight Wire Activities: Prepare desk lamps and bar magnets. Activity 1: Place the bar magnet directly in contact with a desk lamp that is not powered on and observe whether the filament in the bulb swings. Activity 2: Put the table...

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Update Time: 2024-06-30

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

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