9 energized coil (II)通电的线圈(二) How do I change the poles and the magnitude of the magnetic force of an electromagnet?如何改变电磁铁的磁极和磁力大小? I will study the 2nd question first.我先研究第2个问题。 Can the magnetic force size be changed?磁力大小可以改吗 What about the north and south poles of the electromagnet电磁铁的南北极呢 My conjecture of the problem我对问题的猜想 My experimental record我的实验记录 Experimental method实验方法 Experimental phenomenon实验现象 Conclusion结论 Making an electromagnetic crane做一个电磁起重机 Our crane lifts a lot of heavy objects,我们的起重机吊的重物多, Information card资料卡 The main part of an electromagnetic crane is an electromagnet, which is a machine that uses the principle of the magnetic effect of electric current to move steel objects.电磁起重机的主要部分是电磁铁,它是利用电流的磁效应原理搬运钢铁物品的机器。 When the current is connected, the electromagnetic crane can produce a strong magnetic force, tens of tons of iron, wire, nails or other iron materials, without boxing, without packing, and without tying, it can be easily collected and carried to the designated place.当接通电流时,电磁起重机能产生强大的磁场力,几十吨重的铁片、铁丝、铁钉或其他铁料,不用装箱,不用打包,也不用捆扎,就能很方便地收集和搬运到指定的地方。Cut off the current, the magnetism disappears, and the iron and steel weights are put down.切断电流,磁性消失,钢铁重物就被放下来了。 Electromagnetic cranes are very convenient to use and can be used in steel scrap recycling departments, steelmaking workshops, etc.电磁起重机使用十分方便,可以应用在废钢铁回收部门、炼钢车间等。 Electricity can produce magnetism, but can magnetism produce electricity? 电可以产生磁,磁能不能产生电呢? |
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