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关于交流电,高中《物理》书上都有这样的题: 线圈平面跟中性面重合的瞬间,穿过线圈的磁通量最大而感生电动势等于零;线圈平面跟中性面垂直的瞬间,穿过线圈的磁通量等于零而感生电动势最大。为什么? 参考书上的解答是: 根据法拉第电磁感应定律,电路中感生电动势的大小,跟穿过这一电路的磁通量的变化率成正比,而与磁通量大小无关。当线圈平面跟中性面重合的瞬间,虽然磁通量最
With regard to alternating current, the high school book “Physics” has this problem: At the instant that the plane of the coil coincides with the neutral plane, the magnetic flux that passes through the coil is the largest and the induced electromotive force is equal to zero; the instant that the plane of the coil is perpendicular to the neutral plane passes through the coil The magnetic flux equals zero and induces the greatest electromotive force. Why? The answer in the reference book is: According to Faraday’s law of electromagnetic induction, the magnitude of the induced electromotive force in the circuit is proportional to the rate of change of the magnetic flux passing through this circuit, regardless of the magnitude of the magnetic flux. When the coil plane coincides with the neutral plane, although the magnetic flux is the most