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目前很多中学用无线电发射机作电磁波发射和接收的演示实验,因限于条件,一时尚难做到。我们按中学物理教学大纲要求,用类似实验代替,即用感应圈来演示,效果较好。一、实验器材感应圈一个(火花间隙8厘米)。粗铁丝六根(直径约4毫米,长1.30米的1根,1米的4根,0.30米的1根)。氖灯管三个,两端各焊一根引出线。绝缘木座四个,中间钻一小孔,使铁丝能插入。半导体收音机示教板或半导体收音机一部。发报式电键一个(或用压触开关代替)直流电源一组。二、演示方法 1、电磁波的产生演示装置如图一。A、B、C、D铁丝长度均为一米。CD与AB相隔10～20厘米。
At present, many secondary schools use radio transmitters to transmit and receive electromagnetic wave experiments. Due to the limited conditions, it is difficult to do so in a fashion. We according to secondary physics teaching syllabus, with a similar experiment instead, that is, induction ring to demonstrate better effect. First, the experimental equipment induction ring (spark gap 8 cm). Rough iron wire six (diameter of about 4 mm, 1.30 meters long, 1, 4 meters, 0.30 meters a). Neon tube three, both ends of the welding of a lead wire. Four insulated wood blocks, drill a small hole in the middle, so that wire can be inserted. Semiconductor radio teaching board or a semiconductor radio. Send a report of a key (or pressure switch instead of) a set of DC power supply. Second, the presentation method 1, the electromagnetic wave generation device shown in Figure one. A, B, C, D wire length is one meter. CD and AB separated by 10 to 20 cm.