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电磁感应现象是电磁学中的重要现象,由于电路中产生感应电流,那么通过导体横截面的电量也必然是一个热门话题,现就有关的习题归类如下:一、利用q=n△(?)/R直接求通过导体的电量【例1】匀强磁场的磁感应强度为B,方向坚直向上,在磁场中有一个总电阻为R,每边长为L的正方形金属框abcd,其中ab、cd边质量均为m,其它两边质量不计,cd边装有固定的水平轴,现将金属框从水平面位置无初速释放,如图所示,若不计一切摩擦,金属框经时间t刚好到达竖直面位置a’b’cd。
Electromagnetic induction is an important phenomenon in electromagnetism. Because of the induced currents in the circuit, the amount of electricity passing through the conductor cross-section must also be a hot topic. Now the relevant exercises are categorized as follows: 1. Using q = n △ (? ) / R directly through the conductor of electricity [Example 1] uniform magnetic field of magnetic induction B, the direction of straight up, in the magnetic field there is a total resistance of R, each side of the length of the square of the metal box abcd, where ab , cd edge quality are m, the other two sides do not count, cd edge is fixed horizontal axis, now the metal frame from the horizontal position without initial velocity release, as shown in the figure, if all friction is not taken, the metal frame just arrived at time t The vertical plane position a’b’cd.