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直线电流间的相互作用,一般用直流电源供电进行实验。用直流电源供电有不少弊端,如用于电池或低压电源,它们的内阻一般都较大,不易提供强电流,实验效果不显著,且对电源有很大损害;如用蓄电池,它的内阻较小,易提供强电流,但同样对电池也有很大损害,且因蓄电池难于保养,所以一般实验室不备设蓄电池。为了解决上述弊端,我们改用交流电源供电进行实验。装置如图所示,悬挂着的彼此平行的 ABCD 和abcd 为铝导线,其直径约2mm(为增大可见度,可以再粗些),BC(或 bc)长约150mm,AB(或 ab、CD、cd)长约300mm,两铝导线间的距离约10mm,MA(Na、PD、
The interaction between linear currents is generally tested with a DC power supply. The use of DC power supply has many drawbacks, such as for batteries or low-voltage power supplies, their internal resistance is generally larger, not easy to provide strong current, the experimental effect is not significant, and the power is greatly damaged; such as with a battery, it’s Internal resistance is small, easy to provide strong current, but it also has great damage to the battery, and because the battery is difficult to maintain, so the general laboratory does not have a battery. In order to solve the above drawbacks, we switched to AC power for experimentation. As shown in the figure, suspended ABCD and abcd parallel to each other are aluminum wires with a diameter of about 2mm (to increase visibility, they can be thicker), BC (or bc) is about 150mm, AB (or ab, CD) , cd) about 300mm long, the distance between two aluminum wires is about 10mm, MA (Na, PD,