How can I learn the chapter Electricity and Magnetism Physics in the second year of junior high s

First of all, it is not easy to understand the basic principles of magnetism, magnets, and magnetic fields. As for the basic properties of electric fields, there are very detailed explanations in the books, and you should read them repeatedly, and think while watching.

Electricity generates magnetism as an objective fact, and the electric field is born with electricity, and extinguished when electricity is not.

To be honest, when studying electricity, I still strongly recommend that students take a look at the first chapter of electricity, the first part of the current and the current in the circuit diagram, and then take a look!

There is also the need to understand, what is electricity? What is Current!?

Remember, you must think and think more when studying physics! Experiments are also very important, be sure to observe very carefully, and ask the teacher if you don't understand!

Finally, I would like to explain that all the content in the physics subject is actually figured out, of course, junior high school students learn physics as beginners, so you must remember more when you are learning, and remember not to use notes but to keep it in mind!!

Said a lot of nonsense, electromagnetism is a process, in the previous learning most of them are learning a phenomenon rather than a process, so since then physics has become a lot more flexible, but it is still not difficult, as for how to learn, the first is to spend time, and the other is to think more, after doing a question, you should spend 10 times the time to think about a lot of problems, such as the connection between knowledge points, the change of question type, and the purpose of the questioner, If you can't even accurately judge what knowledge points the questioner wants to examine, then it's really troublesome! Don't talk about it, think about it yourself! Think more

1。Do more questions and read the answers carefully.

2。Ask your teacher more.

3。Repeat.

I'll give you a net.,There's only one to apply for.,You learn to pass on that ****.,After that.,There are many teachers on it.,You can tutor you for free.,I've been there recently.。 **:Enroll.

Since you are afraid of changing the question type, it would be good to do more questions and see more question types.

What I said upstairs applies to all, the same as what I didn't say, when I was in junior high school, I had to distinguish all those experiments clearly, and if there was any difference, it would be fine, and the rest of the high school entrance examination would not be used.

It depends on whether you are attentive, if you are attentive, there is nothing that you can't learn.

That means you haven't grasped the basics yet.

If you want to improve, it is recommended that you understand the rules of the left hand and the rule of the right hand, and then practice them appropriately, your attitude is still the most important

This is taught by people, and there are many courseware, about physics. It might help you a bit.

Carefully understand the problem. Ask your teachers and classmates

Physical magnetism in the third year of junior high school mainly studies the magnetic field of magnets, magnetic poles, magnetic fields, and electric currents: Oersted's experiment shows that there is a magnetic field around an electric current.

1. Magnets and poles (poles of the same name repel each other, and poles of different names attract each other).

The property of an object that can attract substances such as iron, cobalt, nickel, etc., is called magnetism. A material that is magnetic is called a magnet. The poles of a magnet always come in pairs.

2. Magnetic field: There is an area around the magnet that acts on other magnets. The basic property of a magnetic field is the effect of a magnetic force on the magnet placed in it.

Direction of magnetic field: When the small magnetic needle is stationary, the direction pointed to by the n pole is the direction of the magnetic field at that point. The magnetic field around the magnet is represented by magnetic inductance lines.

The geomagnetic north pole is near the geographic south pole, and the geomagnetic south pole is near the geographic north pole.

3. The magnetic field of the current: The Oersted experiment shows that there is a magnetic field around the current.

An energized solenoid is externally equivalent to a bar magnet. The relationship between the direction of the current in the energized solenoid and the polarity at both ends of the solenoid can be determined by the right-hand spiral rule. (This method of determination is known as Ampere's rule).

At first, I wanted to learn the basic concepts of magnets, poles, and magnetic lines.

Then we will start talking about some phenomena and experiments: the Oster experiment.

Electromagnetic induction. And finally, it's applied to real life: electric motors, generators, microphones, and so on.

Ask me if you know if you want to, we've just finished our studies, and we're going to enter junior high school physics for review.

The most important thing in the magnetic test is to test the spiral rule of the right hand (Ampere's rule), as well as to draw magnetic inductance lines and directions, and the kind of connection in the circuit to judge the direction of the current or the positive and negative poles of the power supply.

Generally, the test is a picture question, so you don't have to be nervous.

The principle and motor of the generator, the magnetic field, the magnet, and so on. What kind of magnetism and electricity and so on, there is just nothing.

First, I will talk about magnets and poles, and then learn to draw magnetic inductance lines.

Re-study the Oster experiment, energized spiral tube (Ampere's rule).

Finally, let's talk about electric motors.

Mainly study the relationship between electricity and magnetism, there are three important experiments:1Oster Experiment 2Electromagnetic induction phenomenon 3The force exerted by the magnetic field on the electric current.

In addition, there is a separate chapter on magnetism, which mainly studies the characteristics of magnets, magnetic fields, magnetic inductance lines, etc.

Newton's First Law. Magnetic field.

Magnetic Effect of Electric Currents (Magnetism Produced by Electricity): Oster discovered that any wire that is emitted with an electric current can produce a magnetic field around it, a phenomenon called the magnetic effect of electric current.

A non-magnetic metal can produce a magnetic field with an electric current that has the same effect as a magnet.

The magnetic field generated around a long straight wire with an electric current passing through:

A magnetic field is generated around a long straight wire that is current-flowing, and the shape of the magnetic inductance line is a concentric circle closed with the wire as the center, and the direction of the magnetic field is perpendicular to the direction of the current.

When an electric current flows through a conductor, it creates an electromagnetic field around the conductor, and when you put an electric current into the winding, the magnetic fields in the other directions cancel each other out, leaving only the positive and negative magnetic fields.

Electricity and magnetism are inseparable, and they are always intertwined. To put it simply, it is electricity and magnetism.

If a straight metal wire passes through an electric current, then a circular magnetic field will be created in the space around the wire. The greater the current flowing through the wire, the stronger the magnetic field generated.

The magnitude of the magnetic field is calculated using the following formula: h=ni

In this formula, i is the current flowing through the solenoid and n is the number of solenoid coils per unit length.

The flashlight has a small current, and it is only comparable to a single-turn coil.

So the magnetic field is very small...

There are three major aspects of electricity.

Section: 1Ordinary circuits (series-parallel nature, power and use of meters, power and power) 2Home circuits (drawing as well as fire null properties).

3.Electromagnetic conversion (principle of electromagnetism; Judgment of the magnetic field generated in the coil; electromagnetic relays) This is the basic content.

So about the question of your circuit, I think you should remember one thing, you will analyze whether the circuit is in series or parallel, series voltage division, and the nature of parallel shunt must not be forgotten.

If you have a problem with electromagnetism, you must pay attention to the use of the right-hand rule and the problem of drawing electromagnetic induction lines.

You can't be impatient in revision. Remember my brother's words, your goal is to take the high school entrance exam and master knowledge, not the final exam. If you don't do well in the test, the most you can do is because your parents dislike you a few words. The teacher asks you to talk, but you must have a clear goal. Getting the high school entrance examination is your ultimate goal.

Understand the left-handed rule and the right-hand rule, then memorize the formula, and do a little more practice.

Memorize a few key characters and their findings, interspersed with time clues, you can properly look at the basic examples in the textbook, and as for the questions, it depends on how well you memorize the basic knowledge.

Start with experiments, and it's easier to remember what needs to be remembered. Consolidate the foundation of mathematics, and there will be no problem with the forehead.

The first is the formula.

The second is practice.

The more you practice, the better.

You don't explain why electromagnetism is generated.