Why is electromagnetic force perpendicular to magnetic field?

[dorian_gray]

so, i was told F_M= 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 I am very new to the field of physics and would very much like to understand the concept of electromagnetism

 

[kuruman]

I classify this question in the same category as the question "Why do masses attract and not repel?" THe answer to both is "Because that's how Nature works". In other words, it is equivalent to the question "Why does Nature work this way and not differently?"