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初三同学往往对电学中的三个定则理解不透,用的不准,因而我概括了一句话“左力,右电,电磁场右手攥”。是说左手定则是用来判断受力的,即导体因通电而受力的现象中磁场、电流和受力三者方向关系的,对这三者不管判断哪个量的方向都用左手定则。“右电”是说右手定则是用来判断感生电流方向的,即导体因切割磁力线而产生电流现象中的磁场、运动和电流方向的,就是说只要是产生电流的现象,不管哪个量的方向是末知的,都用右手定
In the third grade students, they often understood the three rules in the electrics and were not allowed to use them. Therefore, I summarized one sentence: “left force, right power, right-handed electromagnetic field”. It means that the left-hand rule is used to judge the force, that is, the magnetic field, the current and the force in the force of the conductor due to the energization. The direction of the three is determined by the left-hand rule no matter what the direction is. . “Right power” means that the right-hand rule is used to determine the direction of the induced current, that is, the magnetic field, motion, and current direction in the current phenomenon caused by cutting the magnetic lines of the conductor, that is, as long as it is the phenomenon that generates current, regardless of Which amount of direction is final, all set by the right hand