Heard the News? No Math Today

In front of the college bulletin board.

Several boys were discussing the preview for the third salon.

"Li Mo isn't going to talk about math today..."

"On the interconversion of electric current, magnetic field lines, and mechanical work? What is this, mechanical engineering?"

"Who knows? Anyway, it has nothing to do with calculus."

"By the way, did you hear? Mr. Harrison resigned this morning, and no one taught math class. Mr. Hall even asked Li Mo to substitute for him for a period of time. I heard he solved yesterday's challenging parabola problem in no time."

"He's definitely good at math, everyone knows that... The question is, if he's so good at math, is he just as good at other areas?"

"I don't think so. Think about it, it's only been a few days. Even an old professor from the capital couldn't possibly come up with a completely new set of mathematical theorems every three to five days."

"Are you saying that Li Mo has actually run out of ideas in mathematics?"

"I shouldn't put it so harshly, but I'm probably almost out of mathematical knowledge. I don't want to lose face by shutting down the salon, so I've decided to switch to a less familiar, niche area."

"That makes sense. What fancy tricks can you come up with with electricity?"

As they were talking, Perry hurriedly walked out of the back door of Class 1, carrying a stack of notebooks.

Someone called out to him, "Hey, Perry, where are you going?"

"Attend the class."

"Li Mo isn't teaching math today, he's teaching electricity instead, are you still going to listen?"

"No matter what he says, I will definitely listen."

Since the locker room incident, Perry has become a loyal follower of Li Mo.

How exaggerated is it?

He was already preparing an underground society.

The symbol for joining a club is a large "[Mo]" written inside the collar.

The boys said:

"So, what do we say? Are we going or not?"

"Hey, let's go check it out, I'm curious too."

"Let's go, let's go..."

When they went outside, they found that the place was already packed with people.

Tommy has upgraded his mobile stall to a fixed one today, and he even brought a little girl to help him.

The little girl was very cute, and she would occasionally hand Tommy water.

Some people watched with emotion.

--While other eleven-year-olds were already earning money with their childhood sweethearts, I was still studying at Kuku, oblivious to the world...

With ten minutes to go before the salon started, everyone hurried to shop.

"Tommy, get me two bottles of lemonade."

"Dora, don't give me your change, just grab a handful of extra butter cookies and put them in a bag!"

"Okay, sir, please take this!"

"Give me ten bottles of lemonade!"

Wayne bought ten bottles in one go and directed Perry to help him carry them to the front row.

That kid knows how to get things done.

He reserved the first row for the professors.

Then he even paid out of his own pocket to buy soda and snacks and put them on the chair; that's part of the event planning.

Matthew came today too.

I simply don't want to go home.

My father was summoned to the city hall, his fate unknown... Ugh, I meant to say I don't know if it went well.

My mother started crying as soon as she woke up in the morning; the atmosphere in the house was so oppressive that it was hard to breathe.

Matthew didn't know where to go, or what to say to his mother.

All he could do was go and see Charles, the spokesperson for that mysterious organization.

Matthew asked, "How much money do you need to help our family get through this crisis?"

After a moment of silence, Charles said, "I need to do the math."

Matthew nodded. "If I can afford it, I'm willing to pay any price, but this time, don't try to trick me again..."

Charles couldn't help but yell, "Who tried to trick you? You misunderstood that day, okay? I just can't do anything with you! Damn it, why now of all times...?"

Matthew said "oh" and left.

He's now immune to other people's jokes.

If possible, it would be wonderful to be the hero of the family...

Time's up.

Li Mo was quite punctual today.

Before he could even begin to speak, Perry in the audience had already started clapping!

Li Mo glanced around the scene.

The audience composition has changed slightly today.

Several mechanical engineering professors were sitting in the first row.

They had never heard Li Mo lecture before, so their eyes were filled with curiosity.

After the applause subsided, Li Mo got straight to the point:

Welcome everyone to the third academic salon. Today we'll be discussing electricity and magnetism.

About two weeks ago, while I was tidying my desk at home, a small incident happened...

Li Mo began to tell a story.

Discoveries like this cannot be explained by intuition or inspiration.

There needs to be a little story, like Grandpa Niu sitting under a tree getting hit on the head by an apple and starting to think about gravity or something...

Li Mo politely borrowed a short story about Faraday's discovery of electromagnetic induction.

In this world.

The steam system has developed quite well.

However, there has been virtually no development in the fields of electricity and magnetism.

That's why Li Mo started by explaining the most basic things.

After recounting numerous anecdotes about his discoveries and laying the groundwork, he proceeded with great enthusiasm.

Li Mo gradually got to the point:

"That day I discovered that for a magnet to generate electricity, there's a prerequisite: movement!"

"We can imagine that between the north and south poles of a magnet, there are countless invisible magnetic field lines. When a closed copper wire moves between the magnetic poles, a force is generated inside the copper wire that drives the current. I call this induced electromotive force."

"Through my own quantitative measurements, I summarized the laws governing circuits and electromagnetic induction into three fundamental laws."

"First, in the same circuit segment, the current intensity through a conductor is directly proportional to the voltage across the conductor and inversely proportional to the resistance of the conductor. If we use I to represent current, U to represent voltage, and R to represent resistance, then I is equal to U divided by R. I call this the Li Mo's Fundamental Law of Circuits."

The students immediately opened their notebooks, and Kuku began taking notes.

People tend to memorize mathematical formulas as soon as they see them.

When can we break free from student thinking?

"Second, when a straight conductor of length L moves perpendicularly with a velocity v in a magnetic field of strength B, cutting through magnetic field lines, the induced electromotive force E generated at both ends of the conductor is equal to B multiplied by L and then multiplied by v."

"Third, when an electric current passes through a resistive metal wire, it converts electrical energy into heat. The heat generated, Q, is equal to the square of the current I, multiplied by the resistance R, and then multiplied by the time the current flows, t."

Those boys who were just chattering about Li Mo's lack of talent have now become quiet.

Someone asked:

"Tom, what's multiplied by the third formula? The resistance R multiplied by the time t, right?"

Tom didn't even look up. "Don't ask so many questions, just write it down!"

"Oh, I see! It still has to be Tom. It's okay if you don't understand, as long as no one finds out."

Tom: "?"

He couldn't help but yell, "Shut your stinking mouth!"