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一、定性检测微弱电流: 在进行“导体切割磁力线产生感生电流”的演示实验中,要验证感生电流的存在,要判断感生电流的方向。这只要求定性地检测微弱电流。以前采用多匝线圈来代替单根导体,会使学生不大信服,如用分立元件组成的差动放大电路,由于放大倍数不够,现象不够明显。如图1所示用集成电路组成放大电路,对单根导线切割磁
First, the qualitative detection of weak current: in the “conductor cutting magnetic lines produce induced current ” demonstration experiment, to verify the existence of induced current, to determine the direction of induced current. This only requires the qualitative detection of weak currents. Previously used multi-turn coil instead of a single conductor, will make the students not convinced, such as the use of discrete components of the differential amplifier circuit, due to the magnification is not enough, the phenomenon is not obvious enough. As shown in Figure 1 with the integrated circuit amplifier circuit, a single wire cutting magnetic