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题型1 电磁感应现象中的感应电动势的计算法拉第电磁感应定律 E=(△Φ)/(△t),计算的是在时间△t内的平均感应电动势,当磁通量变化率恒定不变时,感应电动势是恒定的.当导体做切割磁感线运动时 E=BLv,B、L、v 三者两两垂直,若 v 为瞬时速度,则计算出的是瞬时感应电动势;若 v 为平均速度,则计算出的是平均感应电动势.当导体棒以端点为轴,在垂直于磁感线的匀强磁场匀速转动时 E=1/2BL~2ω.
Problem Type 1 Electromagnetic induction in the calculation of the induced electromotive force Faraday’s law of electromagnetic induction E = (△ Φ) / (△ t), calculated is the average induced electromotive force within the time △ t, when the magnetic flux rate of change is constant, The induced electromotive force is constant. When the conductor is cutting the motion of magnetic lines of insensitivity, E=BLv, B, L, and v are perpendicular to each other. If v is instantaneous speed, the instantaneous induced electromotive force is calculated; if v is the average speed, Then, the average induced electromotive force is calculated. When the conductor rod is at the end point, it is E=1/2BL~2ω when it rotates uniformly at a uniform magnetic field perpendicular to the magnetic induction line.