He Suming couldn't help but smile: "Where, where." Since we are a place for information trading here, and I am a member of the Dream Seeking Pavilion, naturally I have to cover a little bit of knowledge, but it is not deep, I only know a little bit of skin knowledge, and sometimes I don't even know a little bit of skin. ”

"I don't know if you've ever learned about the shape of a magnet."

"I haven't studied this part at this time, so I don't know about it." Yan Muye didn't want to deliberately pretend that she didn't understand, so she simply answered the most truthful words.

He Su smiled and said, "It's okay, it's okay, if you don't understand, I'll tell you." ”

"It just so happens that Shen is not at home, and I can help you answer some of your confusing questions here."

"In fact, magnets include a series of magnets, such as square magnets, tile magnets, and special-shaped magnets. Later, with the development of modern science and technology, people discovered attribute magnets, such as samarium cobalt magnets, NdFeB magnets, ferrite magnets, alnico magnets, iron-chromium-cobalt magnets, etc. ”

"I won't continue to expand my research with you, I just want to ask you, don't you think that the stone you got looks like a bar magnet when you look closely?"

"And there's an arrow on one end and a tail on the other."

Yan Muye took a closer look, and after He Suming's little dial, it seemed that he did find that the broken stone he exchanged seemed to be in the shape of a bar. And when exchanging before, Yan Muye also found that the front end of this stone has a little bit of arrowhead, and the end end is a very smooth cuboid.

Seeing this, He Su continued to explain: "Hang the midpoint of the bar magnet with a thin wire. When the bar magnet is stationary, it is natural that its ends will point to the north and south of the earth. The one end pointing north is called the North Pole or N pole, and the one pointing south is the Compass or S pole. ”

"If you think of the Earth as a big magnet, the Earth's magnetic north pole is the guide pole, and the geomagnetic south pole is the north pole."

"This magnet also follows the principle of repulsion of the magnetic poles of the same name and attraction of the magnetic poles of the same name. So, the compass repels from the South Pole, the north arrow repels from the North Pole, and the compass attracts the north arrow. ”

Yan Muye listened to He Suming say so much, and raised his eyebrows a little puzzled: "What is the purpose of you telling me this?" ”

He Suming saw that his careful thoughts were broken by the person in front of him, and couldn't help but smile: "I said these words with ulterior motives. ”

"But don't worry about it now, I'll give you popular science, and after it's over, it's not too late for you to be in a hurry."

"Actually, there are permanent magnets and non-permanent magnets in this world. Permanent magnets are natural products and are also known as natural magnets. Non-permanent magnets, on the other hand, can be artificially made, and they produce magnetic fields under certain special conditions. ”

"The stone you got in exchange is actually a natural magnet. When it finds something that can be mediated with itself, it generates a permanent magnetic field. ”

"If I'm not mistaken, did you let Shen Yuan show you a picture?"

"It's a key, but no one has ever seen a key that looks so strange."

"To be honest, I've actually seen that kind of key."