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带电粒子在复合场中做直线运动,若粒子所受合外力为零,将做匀速直线运动;若粒子所受合外力与运动方向在同一直线上,将做变速直线运动. 1.磁场+电场这类问题一般明确指出不计带电粒子的重力.在分析受力时,要注意: (1)电场力的大小和方向与粒子的速度无关.而洛仑兹力的大小和方向与粒子速度的大小和方向均有关,当粒子的速度方向与磁场方向在同一直线上时,不受洛仑兹力作用. (2)电场力的方向与电场的方向或相同、
The charged particles do a linear motion in the composite field, if the external force of the particle is zero, it will do a uniform linear motion; if the external force and the direction of the motion of the particles are in the same line, it will make a linear motion with variable speed. Such problems generally specify that gravity is not accounted for charged particles. When analyzing forces, note that: (1) The magnitude and direction of the electric force are independent of the velocity of the particles. The size and direction of the Lorentz force and the size of the particle velocity It is related to the direction. When the velocity direction of the particle is in the same line as the direction of the magnetic field, it is not affected by the Lorentz force. (2) The direction of the electric field force is the same as the direction of the electric field,