Wang Xueba System

"Question 301, physics question, please prepare yourself, please read the question."

"As shown in the figure, pr is an insulating plate with a length of l=4m fixed on the horizontal ground, and the whole space has a uniform electric field e parallel to pr..."

"(1): Judging the charged nature of the object, is it a positive charge or a negative charge?"

"(2): The velocities v1 and v2 of the object before and after the collision with the baffle."

"(3): The magnitude of the magnetic induction b."

"(4): The magnitude and direction of the electric field intensity e."

"This question is a big physics question. There are four questions in total, and the answering time is 10 minutes. If you answer a wrong question, you will be considered as a failure. One point will be deducted, and one point will be added for all correct answers. Start the timer."

The host's voice fell, and the familiar countdown appeared on the big screen:

10:59

hiss....

There was a sound of breathing in the scene. The previous math multiple-choice questions were given 5 minutes, but this time the big physics question was only given 10 minutes, and there were 4 small questions, and even the second question still calculated two speeds. It's just a question and answer of five small questions.Calculated according to the time, the contestants need to solve a small question within 2 minutes to complete this answer, and even answering a small question incorrectly will be counted as a failed answer.This is simply no way out.

In front of the TV, the academic masters who had experienced the previous math problems were not discouraged, and once again picked up their pens to calculate this physics problem.

The scene, the audience area of ​​Jincheng Middle School.

There was a smile on Lei Li's face, and he finally reached the physics that Lei Sheng is best at, so he should be stable now.

But Lei Sheng, who trusted his son very much, didn't notice that the physics teacher he brought had an ugly look on his face.Obviously, the physics teacher thought the situation was not as optimistic as Lei Li thought.He hesitated for a while, and wanted to remind him a few times, but when he saw the smile on Lei Li's face, he didn't say it in the end.He has taught in Jincheng Middle School for many years, and he knows Lei Li's temper well, so he doesn't want to suffer from it.

Not far away, Wu Shan and the others looked at each other after asking the physics teacher at their school. When they looked at Lei Li, they couldn't help showing a hint of surprise.

Slightly stunned, Wu Shan, Wang Wentao and others also showed smiles on their faces. It seems that Lei Sheng should be able to solve this problem smoothly, so don't worry about it now, but I didn't expect that that arrogant boy Lei Sheng could still solve the problem. Have this ability.

on the competition table.

Zhao Wenjie and Li Jiaming all looked at Lei Sheng.

"What are you all looking at me for?" Lei Sheng's eyes were a little evasive.

"Nonsense, you're the best in physics among the few of us, who do you look at?" Li Jiaming was a little speechless. Could it be that Lei Sheng was stunned by Luo Hao's problem-solving process just now, and actually asked such a mentally retarded question.

"Uh... this question, I should be able to finish it by myself in 10 minutes." Lei Sheng wanted to boast that it was all on himself, but thinking about Luo Hao's performance before, he restrained himself a little and said something He could barely finish it in 10 minutes, but in fact he knew that at his level, it would take 15 minutes to answer this question completely and correctly.

"Then let's divide the work." Qian Duoduo said.

Several people quickly finished the division of labor and began to answer questions.

Luo Hao, who was doing the question opposite, looked up at them and sneered in his heart: "Fortunately, they are not in the same mind, otherwise I would have to struggle a bit to win."

For a while, the field was quiet.

Ding--

Suddenly, the bell for answering the question rang again.

hum-

The whispering voices at the scene suddenly became denser.

The audience in front of the TV didn't have this restriction, they shouted directly.

"It's too fast."

"How is it possible? Although I am a scumbag, you can't lie to me like this."

"Three minutes and 20 seconds? Can this be done right?" A top student couldn't help it.

The host at the scene was also a little surprised. Although he has graduated for many years, he also knows how long it usually takes for big physics problems. 10 minutes is definitely not a very plentiful time, but now, Luo Hao only took three minutes and 20 seconds to complete the answer. Although he has not checked whether the answer is correct, but with the speed of answering the previous math questions, he has no problem at all. I don't doubt the correctness of Luo Hao's answer.

When Lei Sheng and the others heard the bell, they almost threw away their pens in shock.This is too annoying, right?Five of them can solve a problem, so it's not as fast as one person?Previously, the math problem was only one question, but this physics problem has five questions. They actually counted one question each, but they are still not as fast as Luo Hao?This really hit their self-confidence a bit.

After being stunned for a moment, the horror in the eyes of several people including Lei Sheng was gradually replaced by firmness.As the top performers in their respective schools, no matter whether they are humble or proud, restrained or arrogant, they all have one thing in common. They have a firm belief that they will never be inferior to others.

"To solve the problem, you have already lost your face, and you will also lose if you can't." A thought flashed through the hearts of several people, and then they began to solve the problem more seriously.

Moment, ding--

The bell rang for the five-school alliance to finish answering.

On the big screen, two lines of big characters:

Luo Hao, it took 3 minutes and 20 seconds to answer the question, the answer: ?

The five-school alliance took 4 minutes and 1 second to answer the question, the answer: ?

"Okay, we see that both parties have completed the answers. Now publish the correct answer."

"(1) Positive charge."

"(2) v1 is equal to four times the root of two meters per second, and v2 is equal to two times the root of two meters per second."

"(3)b is equal to one-half square root two t."

"(4)e=2.4n/c"

"Okay, the correct answer has been announced. Now it's time for us to check the answers submitted by both parties. Who can score this question? Let's find out right away."

"This time, let's check Luo Hao's answer first."

The big screen changed for a while.

(1) positive charge

(2) v1 is equal to four times the square root of two meters per second, and v2 is equal to two times the square root of two meters per second

(3) b is equal to one-half square root two t

(4)e=2.4n/c

When Luo Hao's answer was fully revealed, there was already a burst of exclamation at the scene.

"Sure enough, it's all right again. This is simply a human answering machine."

"That's right, let's see how the five-school alliance loses."

......

Although Lei Sheng and the others had foreseen this result a long time ago, they still had some illusions before revealing the answer.However, when Luo Hao's answer was shown in front of everyone, their last illusion was shattered.This is a big physics question, not the previous multiple-choice question. Even if you know the answer, it is impossible to get all four questions right.