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法拉第电磁感应定律:闭合电路中感应电动势的大小跟穿过这一电路的磁通量的变化率成正比.闭合线框完全处于磁场中并与磁场垂直,当线框作垂直切割磁感线运动时,依据法拉第电磁感应定律可知,闭合电路中感应电动势为零,事实上线框其中两边的两端存在电压,没有电动势哪来的电压?这是否矛盾呢?由于电磁感应中的电路问题对学生来说是个难点,为帮助学生理解,法拉第电磁感应定律教学中必须明确以下四点:(1)
Faraday’s Law of Electromagnetic Induction: The magnitude of the induced electromotive force in a closed circuit is proportional to the rate of change of the magnetic flux passing through this circuit. The closed wireframe is completely in the magnetic field and is perpendicular to the magnetic field. When the wireframe is cut perpendicularly to the magnetic induction line, According to Faraday’s law of electromagnetic induction we can see that the induced electromotive force in the closed circuit is zero. In fact, the two ends of the wire frame have voltages at both ends, and where is the electromotive force? Is this a contradiction? Since the circuit problem in electromagnetic induction is a Difficulties, in order to help students understand Faraday’s law of electromagnetic induction must be clear in the following four points: (1)