1一个常用结论导体棒在磁场中做切割磁感线运动时,产生感应电流,受到安培力,进而出现一个耳熟能详的结论:“导体捧做切割磁感线运动以稳定速度运动时,电路获得的电功率等于导体棒克服安培力做功功率.”下面给出结论的推导过程.在图1所示的电路中,磁感应强度大小为B的匀强磁场垂直纸面向里, 1 a common conclusion conductor rod in the magnetic field to do cut magnetic induction line movement, the induction current, by the Ampere force, then there is a familiar conclusion: “conductor holding cutting magnetic induction line movement to a stable speed movement, the circuit is obtained Of the electric power equal to the conductor rod to overcome the Ampere force work power. ”The following gives the derivation of the conclusion in the circuit shown in Figure 1, the magnetic flux density of B uniform magnetic field perpendicular to the paper-oriented,