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分析闭合线框穿越匀强磁场时,关键是分析线框进、出磁场时所受的安培力.从运动和力的角度看,安培力总是阻碍线框相对磁场的运动,可使线框做匀速运动、减速运动或加速运动.从功和能的角度看,线框克服安培力做功,把其它形式的能转化为电能.要注意,如果有穿过线框的磁通量不发生变化的阶段,则此阶段线框中没有感应电流,线框也就不受到安培力
When analyzing a closed wireframe across a uniform magnetic field, the key is to analyze the force of the Ampere when the wireframe enters and exits the magnetic field. From the point of view of motion and force, the Ampere force always hinders the movement of the wireframe relative to the magnetic field, enabling the wireframe to Do uniform motion, decelerate motion, or accelerate motion. From a work and energy standpoint, wireframes work against Ampere forces and convert other forms of energy into electrical energy. Note that if there is a phase where the magnetic flux through the wireframe does not change , there is no induced current in the wireframe at this stage, and the wireframe is not subject to Ampere