Juan followed Lolita to her lab, a very large empty room.

There was a lot of copper coils, cables, and disassembled machinery in a mess.

In front of these objects, there was a large shelf with two metal rails placed parallel to it, one end connected to a cable and the other open, looking like a giant tuning fork, pointing at the wall far away from the empty room.

Lolita placed five fully charged "aquamarines" in an energy tank connected by a magnet copper coil and a "tuning fork".

What kind of thing is this, it actually costs five pieces of blue crystal, and the power consumption is a bit large, no wonder Yaling "saves electricity" and thinks of cutting off the power in the laboratory.

Juan, who was thinking so, saw Lolita take a fist-sized aluminum alloy cuboid and stuck it at the end of the parallel track to connect the cable.

"Look!" Lolita said, closing the switch, and then using an insulating rod, she pushed the aluminum alloy cuboid in the parallel track.

Juan saw the aluminum alloy cuboid stuck in the middle of the two tracks, and quickly slid forward.

Its speed was too fast to see in the blink of an eye.

"Knock"

The wall directly opposite the parallel track made a loud noise, as if it had been hit head-on by a cannonball.

Fortunately, the building was strong enough that this level of damage did not cause cracks in the walls.

Juan rubbed his ears in pain and shouted, "Lolita, you should remind me to wear earplugs!" ”

"What, earbuds?" Lolita pulled the earbuds out of her ear, "Sorry, I've got one here." ”

Before Juan could complain, Lolita had already run to the distant wall to check.

Juan followed.

He saw that the aluminum alloy cuboid had completely disappeared, sticking to the wall like a lump of mud, and there were splashes of debris around it.

"This power is so great, this is the effect of an RPG shot."

"Awesome, my new work, the electromagnetic cannon."

"It turned out to be an electromagnetic cannon, I understand, the two tracks are energized, and an electromagnetic field is formed, and then the electromagnetic field attracts and repels the metal block, and accelerates it out.

"Hey, no, this is an aluminum alloy, can aluminum alloy be magnetized?

"As I recall, it seems that only metals like iron, cobalt, and nickel can be magnetized."

"Aluminum alloy certainly can't be magnetized."

Juan circled: "Then how was this thing shot out of the electromagnetic track, shouldn't it?"

"How can an aluminum alloy without magnetism be affected by a magnetic field, it should stay motionless in orbit?"

"Did your physics teacher teach you?"

"No, I'm a regular school graduate."

"And how did you pass the physics exam?"

"Well, it's just a little bit of skill."

"Cheating is cheating, what's there to hide."

"Don't say it, I want to be faced."

"Okay, then I'll explain it to you."

Returning to Lolita next to the launcher, she pointed to the track that was emitting hot gas due to the violent friction and said:

"When the two rails are connected to the power supply, a large current flows in from one rail, through the metal slide, and back from the other rail.

At this point, a strong magnetic field is generated between the planes of the two guides.

"Under the action of ampere force, the current slider will shoot out at a great speed, theoretically even up to sub-light speed, which is the firing principle of the railgun."

Lolita picked up another piece of aluminum alloy and said:

"In the vicinity of any metal, whenever there is a change in the magnetic flux passing through it, then a closed eddy current is created inside the metal.

"And once this eddy current inside the metal is generated, it forms a magnetic field around itself."

"I understand, so it's not the magnetization of the aluminum alloy itself that is pushed by the orbital magnetic field, but the magnetic field formed by the current inside it, which is pushed by the magnetic field outside.

"But why use aluminum? Isn't it better to use iron? ”

"Because the resistivity of aluminum is small, when the frequency of the magnetic field around it changes relatively large, the eddy current strength in aluminum will also increase accordingly."

"Then why not use copper, which has less resistivity than aluminum."

"Why don't you say silver?"

"Silver is too expensive, burn money, it will hurt to shoot out." Juan held his heart in his hands and made a painful look.

"Hehe," Lolita said with a laugh at Juan, "I don't use aluminum to save money, it's because it's lighter than copper."

"Instantaneous impact force calculation formula: Ft=Mv, you know?"

"You know, F is the average force, t is the time, M is the mass of the object, and v is the velocity."

"You don't seem to know anything about physics."

"I said it, I used a little bit of small means during the exam, and most of it was made by myself."

"Hehe, then I won't say more, you should understand that the smaller the mass of the object, the greater the velocity, under the same average force and time."

"Oh~, so use lighter aluminum, but if the shell is light, will the blow force also become smaller?"

"Looks like that's the part of your cheating on exams."

"Can you stop mentioning this stubble?"

"Hehe, since you know the conservation of momentum, you should also know the conservation of kinetic energy Ek=(1/2)mv²."

Juan patted his head: "I remembered, I didn't cheat on this part, but I forgot it for a long time."

"So the kinetic energy of an object is related to velocity and mass, the greater the velocity of the object, the greater the kinetic energy, the greater the mass, the greater the kinetic energy.

"I just said that the shells will be lighter and the strike force will be smaller, that's the principle, right?"

"Please, the speed is square!

"At Ft=Mv, you can get double the speed by reducing the mass by half.

"When Ek = (1/2) mv², this 1/2 mass multiplied by 2² of the square of the velocity, that is, 4 times, you can get 2 times the kinetic energy.

"My transmitter is affected by the manufacturing process and energy supply, and the ampere force provided can no longer be increased.

"In this case, reducing the mass of the slider is the most effective means of increasing the attack power."

"Papapa", Juan applauded and exclaimed: "It's a scientist in the end, amazing!" ”

"Here, do me a favor, let's try the extreme power of this electromagnetic cannon."

Lolita unceremoniously pulls Zhuangding and sends Juan to do things.

Juan rolled up his sleeves and accompanied Lolita with great interest.

This time, Lolita pulls out a stack of aluminum rectangular sliders.

After activating the cannon, the sliders were fired one after the other, as fast as a percussion drill hitting a wall.

"Knock knock ......"

A deafening sound echoed through the room.

Although Juan covered his ears with strips of cloth, he was still dizzy.

The opposite wall was beaten and plastered with deformed aluminum alloy mounds.

Still, there was not a single crack in the walls.

"Boom"

The track, which was red from repeated high-speed friction, finally couldn't hold up and "exploded".

Juan subconsciously pounced and protected Lolita under him.

"Ah~!"

The sharp pain in his back let Juan know that he was injured and that it was not light.