# Why is electromagnetic force perpendicular to magnetic field?

1. Jul 26, 2010

### dorian_gray

so, i was told FM= qV + B sin$$\theta$$, where $$\theta$$=90 in order to get the full magnitude of the force
but why is the electromagnetic force perpendicular to B?
also, looking upon the right hand rule, if the positive charge is heading towards you, and subsequently the magnetic field is then heading to left of you, the electromagnetic force then heads down; why is that?
perhaps this is a bit of a simplistic question for some, but im very new to the field of physics and would very much like to understand the concept of electromagnetism