Three-point electrostatic field test pen
The structure of the three-point electrostatic field test pen
The insulating base is composed of a static positioning point and a dynamic positioning point of the linear guide rail. The dynamic positioning point can move the wire through the metal hose along the linear guide rail. One end is connected with the test pen, and the other end passes through the insulating base as the connection line of the electric controller. The wires between them are covered with metal hoses, and the ends of the metal hoses can be bent freely as test points. The material is lead core, the lead core is thin, the positioning is accurate, and the conductive microcrystalline lead core will not be scratched during use. The length of the conductive microcrystalline lead core can be adjusted by using the side pressure key and is easy to replace.
The working principle of the three-point electrostatic field test pen
During the experiment, connect the connecting line of the electric controller to the electric controller, and place the static positioning point at electrode A. The dynamic positioning point moves along the guide rail to electrode B: move the test pen on the conductive microcrystal, and use the test point to find The equipotential point, which forms a stable triangle with the 2 anchor points according to geometrical knowledge. No matter where the triangle is placed when it is not deformed. The relative positions of the three vertices of the triangle will not change. Therefore, as long as the two positioning points of the three-point test pen are placed on the corresponding reference points on the coordinate paper, the position of the test point on the coordinate paper is the equipotential point This method of determining the position of the equipotential point is called the three-point positioning method
Advantages of three-point electrostatic field test pen
After the three-point electrostatic field test pen measures the equipotential point on the conductive microcrystal, its position on the coordinate paper can be directly determined by using the three-point positioning method. It not only improves the measurement accuracy and experimental efficiency, but also has the following advantages:
1) With this design, equipotential curves can be drawn on any paper, without special coordinate paper, which reduces the cost of experiments.
2) There is no need to draw coordinate lines on the conductive microcrystal. Reduce the manufacturing process. It can not only improve the manufacturing accuracy, but also reduce the manufacturing cost
3) It has a wide range of applications, and can describe the electric field distribution of a charged body with complex shapes. It can be measured with a three-point electrostatic field test pen without knowing the electrostatic field distribution of the charged body in advance, so it can draw the electric field distribution of a charged body with any shape.
Practice shows that using the three-point electrostatic field test pen to describe the electrostatic field is fast, high-precision, wide-ranging, and low-experimental.
Can engage in more experimental exploration, stimulate students' interest and enthusiasm for learning.
