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原题如图1所示,质量为M的足够长金属导轨abcd放在光滑的绝缘水平面上。一电阻不计,质量为m的导体棒PQ放置在导轨上,始终与导轨接触良好,PQbc构成矩形。棒与导轨间动摩擦因数为μ,棒左侧看两个固定手水平面的立柱。导轨bc段长为L,开始时PQ左侧导轨的总电阻为R,右侧导轨单位长度的电阻为R_0。以ef为界,其左侧匀强磁场方向竖直向上,右侧匀强磁场水平向左,磁感应强度大小均为B。在t=
The original title shown in Figure 1, the quality of M long metal rails abcd on a smooth insulating level. A resistance does not count, mass m of the conductor rod PQ placed on the rail, always in good contact with the rail, PQbc constitute a rectangle. Dynamic friction coefficient between the rod and the rail is μ, the left side of the rod to see two fixed hand level of the column. The length of the rail bc is L, the total resistance of the left rail at the beginning of PQ is R, and the resistance per unit length of the right rail is R_0. With ef as the boundary, the direction of the uniform magnetic field on the left is vertical upward, the magnetic field on the right is horizontal and the magnetic induction intensity is both B. At t =