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测电笔中的短氖管可以说是一种简易的正负电荷检验器。在静电实验中,使用它来检验物体是否带电;确定带电体上带电的性质是十分方便的。如图1所示是一个待测的带电体。取出测电笔中的短氖管,用手拿住它的一端(相当于接地),用另一端去接触带电体。如果氖管的辉光发生在手拿的一端,就表明带电体带正电荷。反之,如果辉光发生在靠近带电体的一端,就表明带电体带负电荷。这样,观察辉
The short tube in the pencil can be said to be a simple positive and negative charge detector. In the electrostatic experiment, it is used to check whether the object is charged; it is very convenient to determine the nature of electrification on the electrified body. As shown in Figure 1 is a live body to be tested. Remove the stub tube from the test pencil, hold it with one hand (corresponding to ground), and use the other end to contact the live body. If the glow of the fistula occurs at one end of the hand, it indicates that the charged body is positively charged. Conversely, if the glow occurs near one end of the live body, it indicates that the live body is negatively charged. In this way, observe the glow