High in the polar regions, the linesofmagneticforce point almost straight upwards.
在极地的高空,磁力线几乎是垂直指向上方。
2
When a charged particle is in a magnetic field, it tends to travel along that field's linesofforce, spiralling as it goes.
当一个带电微粒在磁场中时,它会倾向于沿着磁力线螺旋运动。
3
The existence of electric current in the conductor(not closed)which is cut-ting the magneticlinesofforce(B-lines) variably in the magnetic field is pointed out, and the acceleration is discussed.