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统编高中物理下册学生实验四,以及新编教材中的这个学生实验(实验电路如图1所示),都是用半值法测定电流表的内阻r_g的。实验要求是:当R比R′(或r_g)大很多时,接入R′后干路中电流变化不大,因
The student’s experiment in the senior high school physics textbook and the student experiment in the new textbook (experimental circuit shown in Fig. 1) are all used to determine the internal resistance r_g of the ammeter. The experimental requirement is: When R is much larger than R’ (or r_g), the current in the trunk after R’ is changed little.