[Vật lý 11,12] Con Lắc Đơn Dao Động Trong Điện Trường (Chủ đề 3 - Phần 1)

Hello everyone, now let's go back to the theme that the unit is moving in an electric field environment on the board is the calculator, then this calculator has a content like this, here you read the topic, let me tell you a unit moving in an electric field with a length l is equal to 50 cm is equal to 10 grams this ball is calculated with the calculation point is equal to 5 but for 10 times 6 and put in an even electric field with a straight line down and the force of the electric field is 10.4 volts per meter people say g is equal to 10 meters on the normal line, people say b is equal to 3.14 people ask me to find the moving force of this unit, then people give out four answers. The first answer is 1.4 seconds, the second answer is 1.99 seconds, the third answer is 0.58 seconds and the fourth answer is 1.15 seconds. This is also the calculation of Vinh Phuc School in 2016 2017 before solving this equation, I will tell you in detail that the structure that was built on the speed is called the speed of expression when the unit is placed in an environment that does not have the electric field, then you know that if the unit is placed in the air or in the air in an environment that does not have the external force , it only has the effect of the speed of expression, that is, the effect of the force of the earth, then in the case that it has the effect of the electric field, the speed is no longer g, but the speed is g , it can be greater than g or smaller than g. If the speed is greater than g, it corresponds to the case that this unit has an additional effect of a force to push the ball down below. In this case, I will draw a model here. If our m is here, it has a magnitude of m and the magnetic field is q. The magnetic field of the electric field is straight up and down like this. You can see that when the heavy object is placed here, of course, first of all, it has the effect of the magnetic field. The second one, this magnetic field is the magnetic field due to the magnetic field in the electric field, it has the effect of the force of the electric field and the force of the electric field is calculated as F by the rule of A. If the rule is square, you can see that F is equal to A, but if the rule is square, F and A are the same. In this case, it is because it is the force. It is the same as the force of the electric field. So I see that this heavy object is now the effect of two forces, the magnitude and the force of the electric field. And at the equal position, I see that the string has a force of T, it is equal to these two forces. So we have T at the equal position at the equal position of the string, you have T, it's equal to T, it's equal to B with FFQ, right? T is equal to T with FQ, T is up and B and FQ are down and these two are equal to each other. It turns out that T is equal to B plus FQ. So you can see that this is B, it is equal to M, so we have the speed now not more B