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1.安培力的方向例1在等边三角形的三个顶点a、b、c处,各有一条长直导线垂直穿过纸面,导线中通有大小相等的恒定电流,方向如图
1. Direction of Ampere Force Example 1 At the three vertices a, b, and c of an equilateral triangle, there is a long straight wire passing vertically through the paper surface. There is a constant current of the same size in the wire. The direction is as shown in the figure.