"Magnetic Phenomena: Magnetic Field" Electricity and Magnetism PPT Courseware 6

Description

"Magnetic Phenomena: Magnetic Field" Electricity and Magnetism PPT Courseware 6

learning target

1.Knowledge and skills

Know the concepts of magnetism, magnets, and magnetization; know the regulations of magnetic poles;

Know the rules of interaction between magnetic poles.

(2) Know that there is a magnetic field around the magnet and that the magnetic field has directionality. Knowing the magnetic field lines can be used to vividly describe the magnetic field, and knowing how the direction of the magnetic field is determined.

(3) Know that there is a magnetic field around the earth and the north and south poles of the magnetic field.

2. Process and methods

(1) Observe the interaction between magnets through experiments and sense the existence of magnetic fields.

(2) Experience the process of observing magnetic phenomena and summarizing analogies, and learn to generalize rules from physical phenomena and experiments.

3. Emotional attitudes and values

Experience the fun of learning and inquiry through the process of analysis and observation. acquaintance

The importance of flow and cooperation, and the spirit of proactive cooperation with others.

Exploration Point 1 Understanding Magnetism Phenomenon

1. Read the summary on pages 119-120 of the textbook:

Magnet: A magnetic object.

Properties of magnets: able to attract iron, cobalt, nickel and other substances.

2. Is the magnetic strength of a magnet the same everywhere?

What phenomenon do you use to judge the strength of magnetism?

3. How many strong magnetic parts are there on the magnet? Where are they? What do we call it?

The two strongest magnetic parts on a magnet are called magnetic poles. (Each magnet has two poles)

Research point 2: The interaction between magnetic poles

Experimental exploration: Using the bar-shaped, U-shaped magnets and small magnetic needles on the table (the red end is the N pole), can you figure out the interaction rules between magnetic poles?

Magnetization method

1. Contact or close to a magnet

2. Rub one pole of the magnet in the same direction multiple times (friction magnetization).

Will magnetization cause trouble in our lives?

1. After the mechanical watch is magnetized, the time will be inaccurate;

2. After the color TV picture tube is magnetized, the color is distorted;

Summarize:

1. Magnet: A magnetic object.

2. Properties of magnets: able to attract iron, cobalt, nickel and other substances.

3. The two strongest magnetic parts on a magnet are called magnetic poles. (Each magnet has two poles)

4. The law of interaction between magnets: magnetic poles with the same name repel each other, and magnetic poles with different names attract each other.

5. Some objects can acquire magnetism under certain conditions, a phenomenon called magnetization.

Characteristics of magnetic field lines:

1. A physical model of the magnetic field line hypothesis. (But the magnetic field is real)

2. Outside the magnet, the magnetic field lines originate from the N pole and return to the S pole. Magnetic field lines are closed curves.

3. The tangent direction of a certain point of the magnetic field line indicates the direction of the magnetic field at that point.

4. The density of magnetic field lines indicates the strength of the magnetic field. (The densest magnetic field lines at the magnetic pole indicate the strongest magnetism at the magnetic pole).

5. The magnetic field lines are distributed in the space around the magnet, not just in one plane.

6. Magnetic lines of induction never intersect.

Summary of key points

1. The property of attracting iron, cobalt, nickel and other substances is called magnetism, and magnetic objects are called magnets.

2. The magnetic pole is the strongest magnetic part of the magnet. There are two magnetic poles on each magnet. When two magnets are close to each other, the magnetic poles with the same name repel each other and the magnetic poles with the different names attract each other.

3. Magnetization is the process by which a non-magnetic object acquires magnetism.

4. The magnetic field is a kind of material. When the small magnetic needle is stationary at a certain point in the magnetic field, the direction pointed by the north pole is defined as the direction of the magnetic field at that point.

5. In physics, magnetic field lines are used to describe the magnetic field. The magnetic field lines outside the magnet all start from the N pole of the magnet and return to the S pole. Where the magnetic field is stronger, the magnetic field lines are distributed more densely; where the magnetic field is weaker, the magnetic field lines are distributed sparser. The tangent direction of any point on the magnetic field line is the direction of the magnetic field at that point.

Practice to meet standards

1. There are ____ around the magnet. If the bar magnet is brought close to the small magnetic needle, the direction of the small magnetic needle will generally change. This is the effect of ____ on the small magnetic needle. The compass is one of the four great inventions in ancient my country. A compass can point north because the compass itself, which has ____ properties, is affected by ____.

2. Regarding magnets, magnetic fields and magnetic field lines, which of the following statements is correct ( )

A. Both iron and aluminum can be attracted by magnets B. Magnetic field lines are real curves in the magnetic field

C. The interaction between magnets occurs through the magnetic field. D. The magnetic field lines come out from the S pole of the magnet and return to the N pole of the magnet.

3. At a certain position on the surface of the earth, it is found that when a small magnetic needle that can rotate freely is stationary and the N pole points to the ground, the position may be ( )

A. Geographic Arctic b. Geographically near the South Pole C. Near the geographical North Pole D. near the equator

4. As shown in the figure, when bar magnet B is used to approach N of bar magnet A, and A is far away from B, it can be seen that the A end of B is the __ pole. (fill in "N" or "S")

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For more information about the PPT courseware "Electricity and Magnetic Phenomenon and Magnetic Field", please click the Electricity and Magnetism ppt Magnetic Phenomena and Magnetic Field ppt tab.

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Update Time: 2024-08-19

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