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不少同学对溶液中也存在电流持怀疑态度。为此,笔者设计了一个能证明溶液中也存在电流的实验。一、实验装置和步骤如附图,AB 为浸有饱和 Na_2CO_3溶液的滤纸棒(即用滤纸卷成的纸棒),将此滤纸棒用两根细铜丝AC 和 BD 系紧后,横悬于蹄形磁铁两端的中央,连接250 V 的直流电源(若直流电压太低则现象不明显)和开关 K。关闭开关,发现滤纸棒被突然推出,这说明滤纸棒 AB 间有电流通过。断开开关后,滤纸棒来回摆动。若摆幅较小,可随同摆动的频率将开关一开一
Many students are also skeptical about the current in solution. For this reason, I have designed an experiment that can prove that the electric current also exists in solution. First, the experimental setup and steps as shown in the figure, AB is saturated with saturated Na2CO3 solution filter paper rod (ie, with paper roll into a paper rod), the filter paper stick with two thin copper wire AC and BD system tight, At the center of both ends of the magnet, a 250 V DC power supply is connected (if the DC voltage is too low, the phenomenon is not obvious) and the switch K. Turn off the switch and found that the filter paper rod was suddenly pushed out, indicating that there was a current flow between the filter paper rods AB. Disconnect the switch, the filter rod swing back and forth. If the swing is small, with the swing frequency will switch one