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在电磁感应现象中,安培力做功与焦耳热之间的关系,是高考的热点问题,但是很多学生弄不明白它们之间的关系.W安等于Q吗?请看下面的分析:一、安培力做正功如图1所示,水平面上有两根足够长的光滑平行金属导轨,它们的电阻可忽略不计,左端接有电源,导体棒ab,其电阻为R,与导轨接触良好.整个装置处于方向竖直向下的匀强磁场中,开关S闭合,导体棒ab受到向右的安培力F,向右运动.
In the phenomenon of electromagnetic induction, Ampere force work and the relationship between Joule heat is a hot issue in college entrance examination, but many students do not understand the relationship between them. W An equal to Q? See the following analysis: A, Ampere Force doing positive work shown in Figure 1, the horizontal plane has two long enough smooth parallel metal rails, their resistance is negligible, the left end of the power supply, conductor bar ab, the resistance R, and the rail contact well. The device is in a uniform magnetic field with the direction of vertical downward, the switch S is closed, and the conductor bar ab is subjected to the right ampere force F to the right.