指出了在磁场中做变速切割磁力线（线）运动的导体（不闭合）中有电流存在，讨论了其运动加速度。
The existence of electric current in the conductor(not closed)which is cut-ting the magnetic lines of force(B-lines) variably in the magnetic field is pointed out, and the acceleration is discussed.
线的密度表示磁场的强度，磁场强的地方磁力线就密集。
The density of the lines indicates the magnitude of the field, the lines Being crowded together where the magnetic field is strong.
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