It will be easier for Fu-Kwun Hwang to see what you mean by using the "quote" and edit out the rest away

[quote author=Fu-Kwun Hwang link=topic=33.msg199#msg199 date=1075387170]
So the magnetic force will not change the kinetic energy of the charge particle,

It only [color=red][s]charge[/s][/color] the direction of the velocity for the charge particle.

If the velocity is in the same direction of the magnetic field,
then there is no magnetic force acting on the charge particle.

Yes, crownabhisek  is right, there appears to be a spelling error :) Thanks! crownabhisek