Facing everyone's puzzled eyes, Lao Yang slowly spoke.

"The experiment I did was the famous Faraday electromagnetic induction experiment, and according to my previous teaching experience, this level of cutting magnetic inductance line movement was enough to light up this small 1.5-volt light bulb. However, now everyone can see that the light bulb is not lit at all. ”

"I know, I know, our teacher has done this experiment before, the coil he uses is thick, and it is brand new, the quality of your coil is not good enough, it looks black, maybe it is broken!" Xiaoya was the first to scream.

“......”

Lao Yang was speechless.

"Is the magnet not spinning fast enough?" Xiao Wu also asked.

As for Boss Yue, as well as the third and fourth children behind him, they were all at a loss, indicating that they didn't understand at all, and they didn't understand at all.

Shadow 7 and his group of shadow warriors still wore the poker faces, expressionless, but they could also see from their blank eyes that they didn't understand what this experiment could say.

"Old man Yang, you said this device can light up the light bulb? It can't be, there is not even a power supply, how can you light the light bulb? Although I don't study much, at least I graduated from junior high school, don't fool me! "It's still the fourth child who is educated, and he asked about the idea at once.

"yes, there's no power supply, how can this be bright." Boss Yue was also puzzled.

"Yes, yes, I just said that I think it's weird, how can the light bulb light up without a battery! You say, "Yes?" Hahaha...... "The third child felt that he had discovered the key point, and laughed happily.

“......”

Lao Yang's face was full of helplessness and even more speechless.

Xiaoya's face was slightly red, and she scolded embarrassedly: "Brother, don't be ashamed of you, this is called electromagnetic induction, which can completely generate current, and the generator is a principle, don't you don't know where to pretend to understand!" ”

"Ahem, ahem, this ...... This is how the generator works? ”

"It's that simple, isn't it......"

"This ...... Isn't this light bulb not lit, where did the electricity come from......"

Listening to the questioning of the three big bosses, Lao Yang couldn't sit still and stood up suddenly.

Xu Lemo was silent, those two little girls also looked like half a bottle of water, it is estimated that everyone here has not yet figured out the meaning of his little experiment, he thinks that it is necessary to popularize science for everyone!

"The first is the electric current, it is not necessary to have a battery to have an electric current, in physics, as long as the free charge in the conductor moves in a regular directional motion under the action of the electric field force, an electric current will be formed. To put it bluntly, an electric current is the directional movement of an electric charge in a conductor. ”

"It's like the water in a river, when the water flows in one direction, the boat on the water can go down!"

Boss Yue's eyes widened, and they didn't seem to understand.

The third said weakly: "You can also install an engine on the ship, you don't have to rely on the water to walk." ”

"You, you...... It's called a parable, and you don't understand it......"

Lao Yang's forehead was bruised by this strange understanding.

Xu Le was not happy anymore, and glared at the third child fiercely, so frightened that he retracted his head suddenly, and behaved like a quail.

Lao Yang calmed his breath for a while, and then continued.

"The experiment I just did is called the electromagnetic induction experiment, which refers to the phenomenon that a part of the conductor of a closed circuit moves in a magnetic field to cut magnetic inductance lines, and an electric current is generated in the conductor. This method of generating electric current using a magnetic field is called electromagnetic induction, and the resulting current is called induced current. ”

"This is the definition of electromagnetic induction phenomenon in junior high school textbooks, in fact, there is a more accurate definition: the phenomenon of induced electromotive force due to magnetic flux changes, which is called electromagnetic induction phenomenon."

"This electromagnetic interaction force is one of the four basic forces of nature, and the other forces include......"

Seeing that all the "students" present were full of ignorant expressions, Lao Yang felt that if he continued to talk, it was estimated that he would go off topic again, so he hurriedly changed the conversation and changed his words.

"Now some shopping malls, as well as many small generators used in rural areas, apply this principle."

Lao Yang talked about professional knowledge, he was very serious, and it could be seen that he was definitely a very responsible and good teacher.

It's a pity that most of the people present are stupid and stupid students.

"Oh...... That's right. ”

Boss Yue and the others all nodded pretending to hear this.

"In my set of experimental equipment, the coils are all made of metal wires with high self-inductance coefficient, and they are wound with a lot of turns."

"My magnet is an artificially made neodymium magnet, also known as the magneto, which has extremely high magnetism, and its magnetism is more than 10 times higher than that of ordinary ferrite magnets!"

"So, there is no problem with the experiment I just did, and under normal circumstances, it can light up that little light bulb! However, now the bulbs don't light up at all! ”

"In fact, since the day of the outbreak of the apocalypse, the electromagnetic induction phenomenon shown in this experiment has become weaker and weaker, so the various electronic products and communication equipment we use will become less and less effective!"

"Until last night, after the sound of space shattering, this electromagnetic induction phenomenon was even more greatly disturbed, as if the current in the conductor was blocked by something and could not flow."

"That's why the car can't ignite and can't start. After all, the ignition coil igniting an electric spark is also the result of work done through an electric current. Now the current has suddenly decreased greatly, there is no electric spark, of course, there is no cylinder! ”

This explanation is relatively easy to understand, and the two college students, Xiaoya and Xiaowu, understood it at once.

Boss Yue and the others also understood the second half, it turned out that there was no electric spark and could not ignite, so the car could not start, knowing the reason, it must not be difficult to repair.

Xu Le understood Lao Yang's explanation, but he was even more puzzled, what is the phenomenon of electromagnetic induction, that is one of the most basic rules in this world, but now it has suddenly changed, what is going on!

"Elder Yang, do you know why such a change happened?"

"There's a little bit of speculation, and it just needs the cooperation of an ability evolver like you, Mr. Xu."

"Okay, Old Yang, what do you say, I'll do it!"

Xu Le did not hesitate and agreed, he had already discovered that this Yang Lao was probably far from being as simple as an ordinary professor.

"Then please use your telekinesis, wrap this magnet, and rotate it at a uniform speed in this coil, pay attention to the speed of rotation, and gradually increase it little by little."

At that moment, Xu Le did as Lao Yang said, released his telekinesis, wrapped the coil and the magnet, and made the magnet rotate.

Everyone craned their necks and widened their eyes, waiting for the result.

As the magnet slowly turned faster, the small bulb actually gradually lit up.

At this time, the rotation speed of the magnet is almost the same frequency as when Lao Yang rotates it manually.

Since the magnets rotate at the same speed, why is there such a big difference!

Xu Le can light up the light bulb, but Lao Yang doesn't light it at all!

What is the truth of this?