题在倾角为θ的斜面上有一辆小车,车的底板绝缘,金属板A、B、C等大、正对、垂直地安放在车板上,它们依次相距L,A、B板上各有一等高正对的图1小孔,A与B、B与C之间反向连有电动势各为e1、e2的直流电源,如图1.小车总质量为M,正以速度V。匀速下滑,此时有一带负电的小球正 There is a car on the inclined plane with an inclination of θ. The floor of the car is insulated. The metal plates A, B, C, etc. are large, right-facing, and vertically placed on the car plate. They are separated from each other by L, A, and B plates. Figure 1, the contour of the right hole, A and B, B and C are connected in reverse between the EMF, e2 DC power supply, as shown in Figure 1. The total mass of the car is M, is at speed V. A steady rate of decline, with a negative ball