安培定则是一条经验法则,是经过大量实验总结出来的．运用安培定则,可以很快地判断出通电螺线管的极性、电源的极性、电流的方向或螺线管的绕线方法等． Ampere’s rule is a rule of thumb and is summed up after a lot of experiments. The use of Ampere’s rule can quickly determine the polarity of the energized solenoid, the polarity of the power supply, the direction of the current, or the method of winding the solenoid.