"Electric Magnetism" Electromagnetic Phenomenon PPT Courseware

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"Electric Magnetism" Electromagnetic Phenomenon PPT Courseware

(1) Will the magnetic needle rotate?

As shown in the picture on the right, place a magnetic needle under a straight wire, make the wire contact the battery, connect the circuit, and observe the changes of the small magnetic needle.

The magnetic needle rotates.

(2) What does the rotation of the magnetic needle mean?

When the current is energized, the magnetic needle rotates, indicating that there is a magnetic field around the current.

This magnetic field is in a different direction than the earth's magnetic field, so the magnetic needle rotates.

1. Magnetic effect of electric current

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

2. There is a magnetic field around a current-carrying wire that is related to the direction of the current. This phenomenon is called the magnetic effect of current.

2. Magnetic field of energized solenoid

1. Wrap a wire around a cylinder to make a solenoid (also called a coil). After energization, the magnetic fields of each circle of wires are superimposed and the magnetic field is enhanced.

Explore the magnetic field distribution outside the energized solenoid

Demonstration: Place a small magnetic needle at each end of the solenoid and sprinkle iron filings evenly on the cardboard. After powering on, observe the pointing of the pointer, tap the cardboard, and observe the arrangement of the iron filings.

Changing the direction of the current reverses the direction of the small magnetic needles on both sides.

3. Ampere’s Rule

Hold the solenoid with your right hand and let your four fingers point in the direction of the current in the solenoid. The end pointed by your thumb is the N pole of the solenoid.

Can you use a clever way to express the relationship between the polarity of the two ends of an energized solenoid and the direction of the current in it?

The monkey held a large solenoid under his arm with his right hand and said: If the current flows in the direction pointed by my right arm, the N pole is in front of me.

practice

1. Determine the N and S poles in the solenoid below:

2. Determine the direction of current in a solenoid:

3. According to the direction of the small magnetic needle when it is stationary, the positive and negative poles of the power supply can be determined.

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For more information about the PPT courseware "Electromagnetism and Electromagnetic Phenomenon", please click on the Electromagnetic Phenomenon ppt tab.

"Electric Magnetism" PPT:

"Electric Magnetism" PPT Part One Content: Oersted's Experiment In 1820, Danish physicist Oersted finally experimentally confirmed the existence of a magnetic field around an energized conductor. This major discovery shocked the scientific community and brought electromagnetism into a new era. period of development. The magnetic field of the current...

"Electric Magnetism" Electromagnetic Phenomenon PPT Courseware 3:

"Electric Magnetism" Electromagnetic Phenomenon PPT Courseware 3 Conjecture: The connection between electricity and magnetism. What are the similarities between charged bodies and magnets? A charged object has two kinds of charges, and a magnet has two magnetic poles. The same kind (same name) repels each other, and different kinds (different names) attract each other. Demo 1 (1)..

"Electric Magnetism" Electromagnetic Phenomenon PPT Courseware 2:

"Electric Magnetism" Electromagnetic Phenomenon PPT Courseware 2 Practice 1. An iron block is hung under the spring dynamometer. When the spring dynamometer is moved from N to S, the indication of the spring dynamometer changes with the position. The image is 2． There are two rods a and b with the same shape. If it is as shown in Figure A...

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Update Time: 2024-11-23

This template belongs to Physics courseware Lu Jiao Edition Ninth Grade Physics Volume 2 industry PPT template

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