Chapter 557

Fang Xueqi just wanted to shout when she saw that the test paper had been taken away.

But looking sideways, Qin Chen took it?

Looking at Qin Chen again, Xueqi made a silent gesture.

Then Qin Chen began to alter Fang Xueqi's physics test paper.

"Xueba, this is... Helping me with my test paper?" Fang Xueqi muttered to herself.

Qin Chen doesn't care about Fang Xueqi. There's not much time left now. He wants to help Fang Xueqi finish the test paper as soon as possible.

In fact, just now, Qin Chen decided to grab Fang Xueqi's test paper and help her write it herself.

To avoid the embarrassment of not having enough time.

Qin Chen started writing in the last ten minutes after the exam.

It took him a few minutes to finish his test paper. Now it is estimated that there are only about five minutes left for the exam.

In such a short time, Qin Chen is sure to write the answer on the draft paper.

But after Fang Xueqi read the answer, she didn't have time to write it on her test paper.

It was out of this consideration that Qin Chen planned to help Fang Xueqi do it himself.

This also saves trouble. It is the so-called good man to do it to the end. To send the Buddha to the West!

After winning the test paper, Qin Chen modified it directly on the basis of Fang Xueqi's answer.

Looked at the question and glanced at Fang Xueqi's answer.

Qin Chen found that Fang Xueqi had done a lot, and the accuracy rate was not even 50%.

Well, Fang Xueqi's physics is so bad!

Qin Chen sighed and began to help Fang Xueqi revise her answer.

In fact, it's not Fang Xueqi's poor performance in physics. You know, most of the other candidates in the examination room don't even have a 50% accuracy rate!

After all, the physics exam is too difficult.

Fang Xueqi's physics test paper was filled in. Qin Chen only took 2 minutes to revise it.

Well, there's still time. Look at the answer.

Qin Chen turned over and saw the last question in the physics exam of the third postgraduate, that is, the final question.

I saw this question asked like this.

"As shown in figure a, there is a long straight and thin metal wire in the vacuum, and a metal cylindrical surface with a radius of is placed coaxially with the wire. Assuming that the wire emits electrons with the same rate in the radial direction, the known electron mass is and the charge is. The interaction between the emitted electrons is not considered.

(1) The initial velocity of the emitted electron can be measured by the following two experimental schemes:

A. Only a constant voltage is applied between the cylinder and the conductor;

B. In the cylinder, only a uniform magnetic field parallel to the cylinder is added. "

Qin Chen was a little stunned after reading this topic.

This question is a little interesting. It can be said that the design is very clever, which involves several knowledge points.

Knowledge of initial velocity, electromagnetic field, and voltage.

Although Qin Chen found the test difficult, that's all.

No matter how difficult this question is, it can't catch up with the college entrance examination paper of Qin Chen's previous life.

And this topic has not reached the high school level.

At best, we can catch up with Qin Chen's physics paper for the senior high school entrance examination.

You know, Qin Chen was a top student who graduated from Dongning University in 987.

Solving this junior high school physics knowledge is not easy.

Soon, Qin Chen's answer was written below this question.

"When the voltage is or the magnetic induction is, just no electrons reach the cylinder. Calculate the initial velocity of the emitted electrons respectively..."

Because there are many problems in this topic, the knowledge involved is also very complex.

Therefore, Qin Chen wrote half a page of the test paper.

The examination papers in this world are similar to A4 paper.

Qin Chen wrote half a page of A4 paper, which is equivalent to thousands of words.

However, after writing this topic, I looked up and found that only two minutes had passed.

Now there are a few minutes left before the physics exam is over.

Looking at the time, Qin Chen couldn't help feeling.

"Hey, I haven't done physics problems for a long time. It took me two minutes to write such a simple physics problem. It seems that I really deserve that sentence. Use it forward, waste it back..."

Qin Chen sighed.

If let other grind 3 examinees know, Qin Chen's mind at the moment.

I guess they'll spit out old blood.

Qin Chen did the next physics problem. It took only 2 minutes from examining the problem to writing the answer.

Now I still say it's slow.

Is that human?

Besides, after Qin Chen finished the last question, he was ready to throw the test paper back to Fang Xueqi.

At this time, Fang Xueqi had been waiting like an ant on a hot pot.

She not only expected Qin Chen to help him make the right answer, but also worried that Qin Chen might not be able to do it.

After all, the physics exam is so difficult, especially the latter one.

Obviously, it has gone beyond the outline and designed something like electromagnetic voltage.

Not to mention that she is a graduate student in the Chinese Department, I'm afraid that a graduate student majoring in science has encountered this problem.

You can't get the right answer without spending hours each!

"Qin Chen, can't you give me the answer directly? You have to take my test paper. What can you do if you can't do it later?"

Fang Xueqi looked anxious and looked at Qin Chen who was writing hard. She almost didn't cry.

With the passage of time, Fang Xueqi's face became more and more dignified.

While she was waiting anxiously, Qin Chen finally put down his pen.

"Are you ready? No, it's only a few minutes in the past. Even the multiple-choice questions before revision are not so fast?" Fang Xueqi said in her heart.

But when Fang Xueqi thought like this, Qin Chen turned around and showed an angel like smile.

Seeing Qin Chen's confident smile, Fang Xueqi's gloomy heart was like the melting of ice and snow.

I feel warm all over.

"Yes?" Fang Xueqi whispered.

Qin Chen nodded slightly, then got up and handed in the paper.

She got off her seat because Fang Xueqi's seat was next to the aisle.

When Qin Chen came to her seat, he threw his test paper back to her while the teacher didn't pay attention.

Then Qin Chen left.

Looking at the examination paper in front of Fang Xueqi, I can see that there are traces of alteration in many places above.

Qin Chen revised 30 multiple-choice questions, nearly two-thirds.

Fang Xueqi had only done one of the ten blank filling questions before, and now she has finished all of them.

Look at the last big question, it's actually finished.

Fang Xueqi looked at the process and found that there was no error. She substituted the data into it and checked it. Unexpectedly, it was also right.

Boom!

Fang Xueqi is like a thunderbolt!

She never imagined that Qin Chen could in such a short time.

Help her revise all the questions, even the last big question, and help her finish it!

Seeing this paper, Fang Xueqi immediately realized a problem.

It is her performance in this physics exam that can definitely occupy a great advantage in the total score.

With a full score of 100, Fang Xueqi doesn't expect to take so many exams.

But for now, I'm afraid more than 90 points is no problem.

Resisting the excitement and excitement, Fang Xueqi raised her hand to indicate to the teacher that she would hand in her paper in advance!