Quantitative coulomb law demonstrating scheme

Abstract

The invention provides a quantitative coulomb law demonstrating scheme, and belongs to the field of physics teaching experiments. According to the quantitative coulomb law demonstrating scheme, circular silver paper fixed on an organic glass support serves as electrified bodies, an electronic analytical balance serves as a measuring tool, the quantity of electric charge is controlled by a contact dichotomy, and the distance between the electrified bodies is controlled by a fixing device. During experiment, one of the electrified bodies is placed on a testing table of the electronic analytical balance, the other electrified body is fixed on a support above the analytical balance, and the two electrified bodies face to each other in parallel. The coulomb force between the electrified bodies can be obtained by pressure applied to the measuring and testing table of the electronic analytical balance. In the scheme, the acting force between the electrified bodies, the quantity of electric charge of the electrified bodies and the relation between the distances of the electrified bodies can be obviously demonstrated quantitatively by using a control variable experimenting method. By the quantitative coulomb law demonstrating scheme, classroom demonstration experiments can be carried out in physics teaching of middle schools and colleges, and student experiments can also be carried out in teaching of college physics experiments.

Description

Technical field [0001] The invention relates to a quantitative demonstration scheme of Coulomb's law and belongs to the field of physics teaching experiments. Background technique [0002] In the quantitative experiment of Coulomb's law, simple operation and high measurement accuracy are the keys to success. [0003] Quantitative experiments of Coulomb's law have been measured accurately in scientific research, but the experimental principles and methods are very complicated and cannot be used for teaching demonstrations. [0004] There are two main types of experiments used to quantitatively demonstrate Coulomb's law. The first is the well-known Coulomb torsion balance, which is mainly balanced by the torsion moment of the wire and the Coulomb force moment received by the charged ball, and the angle that the wire turns to reflect the size of the Coulomb force; the second is that some physics teachers open classes at all levels Some self-designed experiments have been used in, main...

AI Technical Summary

Problems solved by technology

These two types of experiments are not simple enough. After the charged body is subjected to the Coulomb force, it reaches an equilibrium state in a new position. In order to measure or control the distance between the two charged bodies, the equilibrium position must be gradually adjusted.

In the long-term adjustment process, the charge amount of the charged body will gradually decrease, increasing the experimental error

At the same time, the accuracy of the second type of experimental scheme is generally low, and only rough results can be obtained. It is greatly affected by environmental factors, and the success rate of on-site demonstration is low.

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