我们知道,当测电笔接触交流电的火线或高压直流电时,氖管会发出桔红色辉光。这是因为在外电场激发下,氖管中的氖原子所发生的辉光放电现象。我们在讲授“静电场”时,也多次运用氖管的这一特性做实验,使看不见、摸不着的静电场变得形象、 We know that when the test pencil touches the live or high voltage direct current of the alternating current, the tube will emit orange-red glow. This is due to the glow discharge that occurs in the neon atoms in the neon tube excited by an external electric field. When we were teaching the “electrostatic field”, we also used this feature of the fistula many times to experiment, so that the invisible and intangible electrostatic fields became images.