Boys and girls are different from their favorite toys as children, which is caused by the difference in the active parts of the brain between men and women. Wang Yiyi talked about the cannon, although the female classmates in the classroom also cast curious eyes, but compared with the excited look of the boy, it was still much calmer.

"Sir, can this really be made into a cannon?" The boy sitting in the first row had a twinkle in his eyes and said with intense concern.

"Absolutely!"

"What a magnet to use!" The boy's lesbian table poured cold water, although he didn't want to deny Wang Yi's affirmation, but he didn't want his table to be too embarrassing, it was too much like a pipe dream.

Wang smiled, although there are also boys' and girls' schools in the Northeast, but the Dashang Affiliated School has been formally co-educational since two years ago, because boys and girls who grow up in this way are more mature than single-sex schools in terms of gender growth and cognition.

"It's true that there aren't that big magnets, and even if they do, they're very cumbersome to use. But when you move up to the next grade, the physics textbooks will teach you a new subject of physics, which is electromagnetism! As for what electromagnetism is, it is simply the mutual conversion of electric and magnetic fields. ”

At this time, a boy with a rather delicate appearance reacted and said, "Sir, I understand, as long as we have power generation equipment, we can make electromagnetic cannons!" ”

In the era before Wang Yi traveled, the electromagnetic cannon was still a weapon of the future. It is no secret that the Celestial Empire is not lagging behind in this regard and has its own research projects. However, compared with the United States, there is still a gap, and Eagle Sauce is indeed the leader in this regard. In 2010, the U.S. Navy announced that it had successfully test-fired an electromagnetic cannon with an initial kinetic energy of 33 megajoules, an initial velocity of 5 times the speed of sound, and a range of up to 200 kilometers. It's just that in the era of anti-ship missiles, such weapons did not have much practical significance. Therefore, the next goal of Eagle Sauce's researchers is to increase the initial kinetic energy of the electromagnetic cannon to 64 megajoules from 2020 to 2025, with an initial velocity of 7.5 times the speed of sound and a range of nearly 400 kilometers.

300 km is a hurdle!

With the exception of the legendary Dongfeng-21D of the Celestial Empire, few conventional anti-ship missiles in general have a range of more than 300 km. Because beyond this distance, the curvature of the earth itself will have a very large impact on navigation, and ordinary anti-ship missiles need to be guided by drones or AWACS aircraft.

In the era that Wang Yi is living in now, building an American electromagnetic cannon is tantamount to a fool's dream. Even back in modern times, there are few countries that can really build electromagnetic guns, let alone Wang Yi's own brother. However, in this era when there are no missiles, the range of 300 kilometers of anti-ship missiles is no longer a dangerous forbidden area, and the range of ordinary warship artillery is about 20 kilometers, and electromagnetic guns seem to have room for survival in advance in this era. Of course, this is only possible on paper, and the shorter the range, the lower the initial velocity of the cannon, and the more powerful it will be. And how to guide long-range shells to hit targets is also a problem that cannot be solved at all in this era. Therefore, although the Northeast has some investment in electromagnetic guns, it is all pre-research in the early stage, and it is impossible to do too much waste under the condition of limited research funds.

"Sir, can you really make the kind of electric cannon you said?" After the end of the course, Xu Shichang was still struggling with this problem. The range frightened him, it was a fairy trick.

"The principle is there, but what about it," Wang Yi smiled, and there were no students around ...... anymore. It is said that when he came out of the classroom, he was similar to Zhao Zilong's battle against Changbanpo, with three layers inside and three layers outside. The guards who followed were not easy to stop those students, and Chu Yuan, the head of the guard, had a great opinion on this.

"How?"

"The current process is not up to the requirements, to be honest, even if it is studied for a few decades, it is not very likely to be manufactured."

Xu Shichang secretly let out a sigh of relief.

"I teach these things to my students to get them interested in scientific research." Wang Yi gave the most normal result.

There are two types of electromagnetic guns: coil guns and railguns, but no matter which one is too advanced for today's era technology. Even if Wang Yi graduated from a relevant university major, there is no possibility of realization. What's more, he is still studying medicine, and he has nothing to do with electromagnetic guns.

The principle of the electromagnetic cannon is very simple, and with Faraday's law of electromagnetic induction, people began to study it accordingly. In 1901, Professor Berkeland of the University of Oslo, Norway, manufactured the world's first electromagnetic transmitter, and he also specially applied for the first world patent for the electromagnetic gun, but later found that the technology at that time could not produce a powerful enough pulse power supply, so that the power of the electromagnetic gun would not be able to be improved, so he was desperate and gave up.

Electromagnetic railguns appeared almost two decades later than this and were made by the Frenchman Villeroube. Later, in 1944, Dr. Hansler of Germany developed a 2-meter-long, 20-millimeter electromagnetic railgun, which could accelerate a cylindrical aluminum projectile weighing 10 grams to 1.08 km/s. In 1945, he connected two electromagnetic railguns in series, allowing the shells to reach a velocity of 1.21 km/s.

During World War II, Japan also studied inductive acceleration electromagnetic railguns, which accelerated a 2 kg projectile to 335 m/s. However, due to the inability to solve key problems such as materials and electricity, the research of electromagnetic railguns has reached a bottleneck.

The problem of pulse power supply and barrel material life is now also plaguing the Dashang Research Institute, and the main reason why Wang Yi did not invest heavily in the research of electromagnetic guns is also based on the above two points. The current main person in charge of the project is none other than Nikola Tesla, who came to the northeast by Eddie. Of course, this is only the least important of his five or six research projects.

This Croatian in his thirties is very satisfied with the life in Northeast China, doing research that interests him in the practical room of the Dashang Research Institute every day, and going to the bar in his spare time to enhance his relationship with female researchers from all over the world. The only thing that displeased him was that Wang Yi only came to the Dashang Research Institute three days a week, and the number of meetings with him was only once half a month. For Nikolai, it was simply unbearable. Although it sounds a little emotional, there are only a few people who can have relevant academic exchanges with Nikolai in the Northeast, and Wang Yi's forward-looking vision is deeply admired by Nikolai.

It is an exaggeration to not see each other for a day, but Nikolai does have a lot of complaints about Wang Yi's frequent busy government affairs. In his view, Wang Yi's unscrupulous work has seriously affected the scientific and technological progress of Northeast China and hindered the development of human science and technology. Wang Yi, who knows his own affairs, is also helpless about this, he is not an immortal, he has a few brushes, and no one knows better than himself.

In fact, Wang Yi didn't tell all the truth to Xu Shichang, the Dashang Research Institute did not conduct large-scale research on electromagnetic guns, but the two problems that plagued the research, pulse power supply and barrel materials, at least the former Wang Yi knew the solution - that is, the energy contained in the high-speed rotating flywheel was released in an instant, and the pulse power required by the electromagnetic gun could be obtained. That's what Nikolai is doing.