I rely on metaphysics to keep the boss alive and get rich

Chapter 327 The Curiosity of the Powerful

Yun Sangyu raised her head and squinted, not knowing what to say, the corners of her mouth twitched a few times.

After that, I explained it seriously.

Unknowingly, more and more students surrounded me.

Even the top students in the class came over.

Yun Sangyu had already explained it, but unfortunately, everyone around her understood it.

There's no way, I can only continue to say it again.

"Hey, look, Figure 17 is a vertical cross-sectional view of a certain device. The dotted line AA is the intersection line between the vertical cross-section and the boundary surface of the magnetic field area. The uniform magnetic field is distributed in the right area of ​​AAz, and the magnetic induction intensity B=0.4T , the direction is perpendicular to the paper surface outward.
In fact, it can be seen that it is necessary to analyze the initial speed, which is obviously a routine problem.

However, this question has an additional trap than the traditional place for giving points, that is, the position where the particles fly out is not clearly determined, so the initial velocity of the final flight out of the magnetic field boundary does not consider whether it can pass through the shutter.There should be a range. "

Yun Sangyu's explanation can be said to be very clear, but this question is not in the textbook, so even the teacher hasn't talked about it.

The students are inevitably a little confused.

As for the top students, there are some tricks to understand:
"I know, I know."

After finishing speaking excitedly, he directly took the pen from the sitting classmate's hand, and began to type a draft on the paper.

For a moment, the entire classroom was silent, and everyone held their breath, the kind that didn't dare to take a breath.

Finally, Xueba's classmate filled the draft paper with eloquence.

"I made it, student Yun Sangyu, can you take a look?"

Uh.

"The front is right, but the back is wrong!"

???

Xueba quickly grabbed his draft paper and read it, but no matter how he looked at it, he didn't see any problems.

Finally, with a frown:

"Why is it wrong later? I solved it according to the formula, there should be no mistakes!"

Yun Sangyu pursed her lips:
"The formula you used is correct, but you used one less formula, which led to a deviation in the final result."

After finishing the words, he took away the pen and paper from Du Fei's hand, and wrote on the paper.

The speed is faster and more concise than that of the bully classmates who just graduated from school, and even drew a picture, which is more easy to understand.

When the last word falls, stop writing instantly.

"Let's see."

This, the big guys can't understand it!
Especially Duffy, who didn't understand a single punctuation mark.

However, it did not delay Du Fei's crazy admiration for his roommate and deskmate.

"Sang Yu, you are too powerful!"

The classmate next to him said anxiously:
"Student Yun Sangyu, please tell me."

Such a difficult question is very likely to be encountered during the college entrance examination.

Therefore, everyone is very concerned.

The Xueba student actually understood most of it, but he also followed suit.

"Student Yun, just tell everyone."

Probably, this is the strong desire for knowledge.

Seeing this, Yun Sangyu couldn't refuse anymore:

"Okay, let me say it again. In fact, I have already finished the first question of this question in the picture. There is still a step that needs to satisfy the shutter switch. To make it able to enter and come out, it needs to meet the pre-collision and The flying time after the magnetic collision is preferably an integer ~ times nT of the shutter opening period, so the last equation in the first question is L/v0+L/0.5vO=nT, and substituting the above known range to solve one or After several solutions, the result is v0=100m/s.”

Some of the students around have already understood it. After all, it has been said three times, so the pig should understand it.

(End of this chapter)