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O1

O2

B

——洛仑兹力 磁场对运动电荷的作用

I

F垂直于v 、 B所在平面

+q

-q

+q

［问题1］这段导线中电流I的微观表达式是多少？

［问题2］这段导体所受的安培力为多大？

［问题3］这段导体中含有多少自由电荷数？

［问题4］每个自由电荷所受的洛伦兹力大小为多大？

v

B

F ＝ qvB sin

F ＝？

+q

-q

+q

60°

+q

v

v

-q

1. 运动电荷电量为q=2×10－8C，速度大小为v=4×103m／s，电性和方向如图所示，匀强磁场磁感应强度为B=0.5T，求电荷受到的洛仑兹力的大小和方向。

q

P

2. 如图所示，某一带电粒子垂直射入一个垂直纸面向里的匀强磁场，并经过P点，试判断带电粒子的电性。