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一、单项选择题 1.在进行电流磁效应的奥斯特实验时,通电直导线水平放置的方位是:( ) A.平行南北方向,在小磁针上方. B.平行东西方向,在小磁针上方. C.沿正东南力佝,在小磁针上方. D.沿正西南方向,在小磁针上方. 2.如图1所示,1和2是两电阻R_1和R_2的电流—电压图象,它们把第一象限分成Ⅰ、Ⅱ、Ⅲ三个区域。若将R_1和R_2串联,则串联后总电阻的电流一电压图象:( )
First, single-choice multiple-choice questions 1. In the Auster experiment of current magnetic effect, the orientation of the horizontal wire is: () A. Parallel north-south direction, above the small magnetic needle. B. Parallel east-west direction, in the small magnetic needle Above. C. Force along the southeast direction, above the small magnetic needle. D. Along the southwest direction, above the small magnetic needle. 2. As shown in Figure 1, 1 and 2 are current-voltage images of two resistors R_1 and R_2. They divide the first quadrant into three areas: I, II, and III. If R_1 and R_2 are connected in series, then the current-voltage image of the total resistance after series connection: ()