在各类成人高等学校招生考试复习丛书中有一道关于电磁感应的例题。为了便于分析讨论,现连同其解一起辑录于下: [例]如图1所示,两个闭合电略的直线部分L_1,L_2互相平行,L_1中通有电流I_1,当L_1向L_2平移靠近时,试判断L_2中产生的感生电流的方向和它受到的作用力的方向。 There are examples of electromagnetic induction in various adult college admission examination review books. In order to facilitate analysis and discussion, now together with the solution is included in the following: [Example] As shown in Figure 1, two closed straight lines L_1, L_2 parallel to each other, L_1 in the current I_1, when L_1 to L_2 translation close When you try to determine the direction of the induced current generated in L2 and the direction of the force it receives.