Rebirth 91, this time I want to be a doctor

Wang Tongguang stood in the corridor on the third floor and looked out the window with a smile on his face and full of ambition. Under the wave of people going to sea, he resolutely quit his job at school last year and opened this cram school. He didn't expect that this step was really the right one. .

The current price of tutoring for college students is usually 5 yuan per hour, and the teachers he recruits here are all teachers who have resigned to go to work or are part-time graduate students. A one-and-a-half-hour one-on-one lesson is directly priced at 30-50 yuan, which is more expensive than tutoring for college students. The price is several times more expensive. It targets wealthy families and takes the high-end route. Unexpectedly, the enrollment results are very good. I dare not say that I will make a fortune every day, but my daily income during the summer vacation is more than the previous month's salary.

But there are also some happy worries, that is, there are not enough teachers, and classes can no longer be scheduled. It seems that we need to recruit a group of outstanding teachers.

When he was worried, the front desk staff came to call him: "Principal Wang, there is a young man outside and he said he wants to apply for a job."

Wang Tongguang hurried to the front desk and saw a young man wearing a white shirt and glasses. His leather shoes were polished and he looked very young. He should not be more than 20 years old.The young man smiled and said, "Hello, Principal Wang, are you still short of teachers?"

Wang Tongguang looked at Liu Xiaochuan in front of him and asked, "Are you a college student?"

"Yes, my name is Liu Xiaochuan. I am a student at the Normal College. I will start my sophomore year again."

"I am indeed in need of teachers, but our part-time teachers are all graduate students with rich teaching experience, and you are only in your second year of school."

"Principal Wang, although I am an undergraduate student, I also have rich teaching experience. I worked as a tutor for a year during my freshman year. In addition, as long as I teach well, undergraduate students are not necessarily worse than graduate students. . In this case, Principal Wang, I have inquired about it. Your salary structure here is basic salary plus commission. I don’t want a basic salary, just commission."

"Oh, you are quite confident, then why don't you become a tutor yourself and come to my place?" Wang Tongguang asked again.

"It's very simple. In order to make more money, I work as a tutor outside. Even if I teach well, I can only earn ten yuan at most for an hour, and I have to go to the door to teach. And you are a high-end platform here, and the unit price is higher than outside. It’s high, and you don’t have to go to the door to give lectures, which saves time and allows you to take many more classes every day. So, no matter how high your ability is, it’s useless without a good platform, you’re right!” Liu Xiaochuan talked eloquently.

"I agree with what you said. This is a high-end platform for education and training. Only if we set the price high and do not bargain or lower the price can we increase our value. Of course, the teaching quality must also match our price." Wang Tongguang said heartily Said, the young man is quite knowledgeable.

"Just talk and don't practice tricks. In this way, Principal Wang, you listen to my lecture first. If you feel that what I lecture is not good, I will turn around and leave. If you feel that it is okay and worthy of our high-end platform, we will talk about other things." .”

"Okay, tell me, what subject are you good at teaching?"

"I'm good at physics and math."

"On our high-end platform, teachers can only teach one class to demonstrate their professionalism."

"I understand, then teach physics. I'm better at this."

"Okay, then come with me. Let's find an empty classroom, and you can treat me as your student." After that, Wang Tongguang led Liu Xiaochuan to a small classroom. The classroom was partitioned off from the back and was very small. It was only four or five square meters, with two tables and chairs and a small blackboard on the wall.

"Choose a section to talk about. Can you talk about junior high school or high school?" Wang Tongguang asked.

"To be honest, I can teach senior high school students, but relatively speaking, I prefer teaching high school students. As for which part of the content to teach? I chose it myself and it doesn't show my ability. Principal, please specify a section of content, whether it is a new class or a topic. That's fine, you can choose whatever you want." Liu Xiaochuan was full of confidence.

"Okay, since you are so confident, I will choose a paragraph." Wang Tongguang found a physics book, flipped through it, and said, "Let's talk about this 'Coulomb's Law'"

Liu Xiaochuan did not stand in front of the blackboard with a book and started lecturing directly.

"Students, in the previous lesson, we learned that charges of the same type repel each other and charges of different types attract each other. This shows that there is a force between charges. We call this force the electric field force.

So what does the magnitude of this electric field force between charges have to do with?Let's assume that there are two charges, one in China and one in the United States. Is there an electric field force between them?

Definitely not, because it is too far away. Even if one is in the north of the city and the other is in the south, the strength is almost gone.Therefore, the closer they are, the greater the force, and the force is negatively related to the distance between the charges. "

Wang Tongguang couldn't help but nodded secretly after hearing this. This is a good example.

"Let's talk about the force between charges. If there is no electric charge, there will definitely be no force. The greater the electric charge, the greater the force. The force is related to the magnitude of the two electric charges. It is positively related. What is the specific relationship? , Coulomb came to the conclusion through the torsion balance experiment, which is the formula on the blackboard, called Coulomb's law.

Let's look at this formula. Is it very similar to the universal gravitation formula we learned last semester? The format is the same. The universal gravitation formula has a universal gravitation constant. This value was measured by Cavendish using a torsion balance.

The constant in Coulomb's law is called the electrostatic force constant. The value is not measured, but calculated by Maxwell.

Let’s talk about another interesting thing. Both Cavendish and Cullen used a torsion scale for experiments. So who invented this torsion scale? Did one person learn from the other?

The answer is that they invented the torsion scale separately, within a few years of each other. These two people, one is British and the other is French, did not know each other at all.

Okay, that’s it for this knowledge point about Coulomb’s law. Later we will do some exercises based on the formula. Students, do you understand? "

Wang Tongguang had to admit that Liu Xiaochuan did not brag and what he said was true and good. At least he understood it clearly.

Next, Wang Tongguang found a college entrance examination mock paper and pointed to two questions for Liu Xiaochuan to answer. Liu Xiaochuan simply read the questions and wrote the problem-solving process on the blackboard without any pause. He wrote and talked at the same time. Vivid and easy to understand.

At this time, a tall and thin teacher stood at the door of the small classroom, holding a book in his hand. He had been listening for a while. When Liu Xiaochuan finished speaking, he walked in and applauded: "Little brother, you talked very well."

Liu Xiaochuan looked at this person. He knew him as math teacher Liao Hongwen. When he worked here in his previous life, Liao Hongwen was still here and was a veteran of the Chunfeng Tutoring Class.

"You also think the lecture is good, right, Teacher Liao. Teacher Xiao Liu's level is indeed extraordinary." Wang Tongguang had already changed his name to Liu Xiaochuan as Teacher Xiao Liu at this time.