42、一带电粒子平行磁感应线射入匀强磁场，则它作___运动； If a parallel magnetic induction line of the electric particle is injected into the uniform magnetic field, it will move ___.A．直线； straight lines;B．变速率圆周； speed change rate of the circumference;C．匀速率圆周； uniform speed of the circumference;D．螺线； spiral;
42、一带电粒子平行磁感应线射入匀强磁场，则它作___运动； If a parallel magnetic induction line of the electric particle is injected into the uniform magnetic field, it will move ___.
A．直线； straight lines;
B．变速率圆周； speed change rate of the circumference;
C．匀速率圆周； uniform speed of the circumference;
D．螺线； spiral;
参考答案和解析
A
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