Zhu Cijing wanted Xu Fuyuan and Xia Yunyi to learn the law of electromagnetic induction. After they had a preliminary understanding of electricity, this magnetism naturally had to be demonstrated. The next small experiment he would conduct was to demonstrate magnetic lines with iron powder.

At this time, Xu Fuyuan and Xia Yunyi were already shocked. They had already vaguely understood that what the emperor asked them to do might be related to lightning. It was the lightning above the nine heavens, which was heart-shaking when thinking about it.

They were trembling, but Zhu Cijiu did not tremble. He calmly directed a group of eunuchs to continue the experimental course. Then he brought up a thick square wooden board, which was two feet square and was about two inches thick. It was square, smooth and flat, and it was a good piece of wood.

Although the wooden board is good, it is not the point. The key is that there are two rectangular grooves on the wooden board, about two fingers in thickness, about an inch apart. What should we do? Why do we need to pick two grooves on the good wooden board?

The answer was soon revealed, and two eunuchs came up with an exquisite wooden plate. There were two long black stones on the wooden plate. Judging from the size, they were just embedded in the trough of the wooden board.

Zhu Cijing picked up a black stone in one hand and let his back hands slowly approach it. With a slight "bang", the two stones stuck together. He asked with hope: "Do you know what this is?"

This is not a novel thing, it is just two pieces of iron-sucking stones. Xu Fuyuan and Xia Yunyi have naturally seen each other. Look at me and I look at you, and I feel embarrassed to answer. In the end, Xu Fuyuan repeatedly gave in with his eyes. Xia Yunyi nodded and said, "If you go back to the emperor, we know that this is iron-sucking stone."

Since I knew it, there was no need to explain it. Zhu Cijiu broke open the two iron-sucking stones and stuffed them into the trough of the wooden board, and then signaled it like Cao Huachun.

Cao Huachun gave a light order, and immediately two eunuchs came up with an exquisite wooden plate. However, what came up this time was a bit strange. It turned out to be a stack of thick cardboard with white surface and a glass bottle containing black powder. What are you doing?

Zhu Cijing did not let them guess. As soon as the thing came up, he immediately took a piece of cardboard and placed it on the table. Then he picked up the glass bottle and evenly sprinkled the powder on the cardboard. While sprinkling, he explained: "There is iron powder in it, so you can take a closer look."

After sprinkling iron powder, he immediately covered the cardboard on the wooden board. The size was just right, and the cardboard and the wooden board were closely tied together, as if they were a whole. Of course, this was not the point, and the next point was the point.

Zhu Cijiu gently bounced up on the cardboard with his fingers, and a magical scene appeared. The iron powder on the cardboard gradually began to form a regular pattern. The place where the magnets below were two thick black squares, but other places showed evenly spaced arcs, and the arcs between the two magnets were blended together to form complete arcs.

Xu Fuyuan and Xia Yunyi looked at all this in surprise. It was so amazing. What was going on?

Zhu Cijing continued to explain: "Iron-sucking stone is also called a magnet. There are magnetic lines around the magnet that are invisible to the naked eye. This magnetic lines are born with magnets. You don't need to understand how they came from. Just know that there is this thing. Come to Fuzhai and try it first."

After saying that, he gently picked up the cardboard, placed it aside, then picked up the glass bottle on the table and stuffed it into Xu Fuyuan's hand.

Xu Fuyuan was still very interested in this novel "experiment". Now that the emperor asked him to do it, he did not twist. He respectfully took the glass bottle, imitated Zhu Cijiu, took a piece of clean cardboard, evenly sprinkled the iron powder on the cardboard, then covered the cardboard on the wooden board, and gently bounced it with his fingers.

The iron fans slowly gathered to form a pattern similar to that just now. Zhu Cijing nodded and said, "Yeah, it's not bad. I've seen it very seriously and learned it very much. Fuzhai, please stand back first."

Xu Fuyuan received the praise from the emperor and stood back happily, and his nervous mood was relieved.

Next, Zhu Cijing gently placed the cardboard used by Xu Fuyuan on the side, then took out a magnet, poured it back in the direction, and then said to Xia Yunyi: "Yi Zhong, come and try it too."

Xia Yunyi had already been eager to try it out. Hearing this, he immediately couldn't wait to step forward and pick up a piece of clean cardboard. He imitated Zhu Cijiong, picked up a glass bottle and sprinkled the iron powder evenly on the cardboard, then covered the cardboard on the wooden board, and gently bounced it with his fingers.

The pattern formed this time is different from the previous two. The arcs where the two magnets intersect are actually staggered. Did he do something wrong? Xia Yunyi bulged his eyes and looked at the magnetic lines on the cardboard, stunned.

Zhu Cijing walked up to him affectionately, picked up the cardboard and placed it aside, then pulled out the two magnets inside, stuffed them into Xia Yunyi's hands, and explained with a smile: "Yi Zhong, you did nothing wrong. This magnet has polarity, repulsiveness of the same pole, and attracting the same pole, you will know if you try it."

Xia Yunyi breathed a sigh of relief when she heard this. He was shocked just now. It was not a joke to do something wrong in front of the emperor. At the least, it would be out of favor, and at the worst, it would be lost. Fortunately, he did nothing wrong.

He calmed down and slowly approached the two magnets in his hand. Sure enough, he felt a mutually repulsive force. He imitated Zhu Cijiu's appearance, poured the magnets into the head, and then slowly approached. With a slight "bang", the two magnets stuck together.

At that time, I saw a single piece of iron-sucking stone even if I had a lot of knowledge, who would be bored to find two pieces of iron-sucking stones to suck it towards me? For a moment, Xia Yunyi felt very novel and kept turning around with two magnets, approaching each other in various directions and angles, and having fun playing, making Xu Fuyuan on the side look at him.

Seeing this, Zhu Cijing shook his head and smiled, "Okay, I have collected a lot of this thing by the Ministry of Works. You can find Changgeng to ask for a few pieces to play with. Yi Zhong, put the magnet back, and we will continue with the next experiment."

When Xia Yunyi heard this, her face turned shy and she quickly stuffed two magnets back into the wooden trough, and then stepped aside respectfully.

Zhu Cijiu showed Cao Huachun again, and then two eunuchs came in, but the things that were doing the experiment this time were a bit big, and they came in with a large wooden plate.

How to describe the things that were lifted up this time? Simply put, it is a thick wooden board with a wheel for hand-spinning. There are also two grooves on the thick wooden board, but the inside is obviously not a magnet, but it looks like an ordinary iron block; the wheels for hand-spinning are not complete, there is only a log pole in the middle, no spinning wheel, and there is also a magnet tied to the pole.

After the two eunuchs put the things on the long table, they respectfully stepped out. Zhu Cijiu stepped forward and started to operate them personally. He first deducted two iron blocks and demonstrated them to Xu Fuyuan and Xia Yunyi. Even if they were placed very close, there was no sign of attracting each other. Then he said, "This is an ordinary iron block, not an iron sucking stone. Come and try it."

After saying that, he stuffed two iron blocks into Xu Fuyuan's hand. Xu Fuyuan tried several times with the two iron blocks. Sure enough, they were two ordinary iron blocks with no magnetic force at all. After the trial, he respectfully returned the iron block to Zhu Cijing.

Zhu Cijing took the iron blocks, stuffed them back into the wooden trough, then took out a piece of clean cardboard, sprinkled some iron powder evenly, then covered the cardboard on the wooden board, and gently bounced it up with his fingers, but the iron powder on the cardboard naturally didn't move at all.

Zhu Cijing did not stop there, but instead placed the cardboard aside, and then pulled out an iron block. Then he picked up a long thin golden wire from the wooden plate, carefully wrapped it around the iron block a few times, and then stuffed the iron block back into the wooden trough. Then, he turned the thin golden wire under the spinning wheel, arranged it into a rough ring, and twisted the two ends of the golden wire together.

After doing all this, he clapped his hands and said mysteriously: "Next, you have to look carefully. This is the focus of what I want you to learn today."

Xu Fuyuan and Xia Yunyi had naturally seen the thin golden silk for a long time. They thought it was for decoration, and they were also for "experiment" after a long time. Now the emperor asked them to look carefully, so they naturally bulged their eyes and stared at the emperor's hands seriously.

Zhu Cijing gently covered the iron powdered cardboard back on the wooden board filled with iron blocks, then grabbed the rotating handle of the spinning wheel and turned it hard.

A magical scene appeared again. The iron powder on the cardboard actually slowly gathered towards the iron block surrounding the golden thread, and soon formed a regular long strip above the iron block. Zhu Cijiong turned the handle and said, "Fuzhai stepped forward and bounced the cardboard, just like before."

When Xu Fuyuan heard this, he quickly stepped forward and gently flexed the cardboard. A magnetic line of force appeared on the cardboard like before, but there was only the iron block that was wrapped around the golden wire, and there was still no movement above the iron block that was not wrapped around the golden wire.

At this time, Zhu Cijing stopped turning the wheel and said solemnly: "You remember, this is the point I asked you to learn. Now I will explain it to you. You may not understand it, but you must remember it, remember it in your heart and slowly understand it. One day you will understand it."

Then, he pointed to the thin gold wire and said, "This is made of gold wire, gold, silver, copper, iron and other things, actually have one commonality, that is, they can all conduct electricity. I gave them a name, which is metal. All those with similar properties as gold are called metals. Remember that metals have one commonality, that is, they can all conduct electricity."

Then, he pointed to the magnet on the wheel: "This is a sucking stone, also called a magnet. You saw it just now. There are magnetic lines around the magnet that cannot be seen by the naked eye."

Finally, he pointed to the magnetic line pattern on the newly taken cardboard and said solemnly in a majestic tone: "I have done so many experiments to make you understand that when the loop formed by metal acts as a cutting magnetic inductance line, electricity will be generated in the metal loop, and if the charged metal wire is wound into a coil, it will produce magnetic force, which is like the magnetism of iron-sucking stone, which means that electricity and magnetism can be generated together!"

Well, it’s metal, loop, electricity, etc. There are too many fresh nouns. Most ancient people probably would be confused by the scoundrels, but Xu Fuyuan and Xia Yunyi are not ordinary people. They are quick-thinking and have strong logic. They are the kind of geniuses who study science. In addition, Zhu Cijiu has conducted a series of experiments for them to demonstrate. They really understand the principle of electromagnetic interaction!
Chapter completed!