Lecture 2 The effect of the magnetic field on the current-The general review of the physical and difficult points of the 2013 college entrance examination. As shown in the figure, the horizontal parallel metal rails are separated by d, one end of the rail is connected to the power supply, and the magnetic induction intensity of the uniform magnetic field perpendicular to the plane of the rail is B, the direction is shown in the figure. The metal rod ab of length l is still on the guide rail, and the angle between the rod and the parallel guide rail is 60 °. At this time, the current through the metal rod is I, then the ampere force of the metal rod is for
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