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一、选择题(在每小题给出的四个选项中,有一个或几个是正确的)1.在研究电磁感应现象的实验时,若原线圈与副线圈的位置刚好接错,则()A.会烧坏电表.B.电流表指针不会发生偏转.C.电流表指针会偏转,但效果较差.D.电流表指针会偏转,其效果与不接错时相同.2.在电场中等势线的描绘实验中,下列措施中会影响所描绘的等势线的形状的是()A.把直流电源的电压变为原来的两倍.B.把直流电源的电压变为原来的一半.C.把圆柱形电极改为长方体电极.D.把灵敏电流计换成内阻很大的电压表,利用电压表探测基准点的等势点.
First, multiple-choice questions (one or several of the four options given in each question are correct). 1. When studying electromagnetic induction phenomena, if the position of the original coil and the secondary coil is just wrong, then A. Will burn the meter. B. The current meter pointer will not be deflected. C. The current meter pointer will deflect, but the effect is poor. D. The current meter pointer will be deflected, the effect is the same as when no error. 2. In the electric field In the line drawing experiment, the following measures will affect the shape of the equipotential line drawn. () A. The voltage of the DC power supply is doubled. B. The voltage of the DC power supply is halved. C. Change the cylindrical electrode to a rectangular parallelepiped electrode. D. Replace the sensitive ammeter with a voltmeter with a large internal resistance, and use the voltmeter to detect the isopotential point of the reference point.