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## Homework Statement

Given the formula for the force on a charge in an electric and magnetic field is F = eE + ev X B

why can the magnetic field never increase the energy of a particle that travels through

it

## Homework Equations

N/A

## The Attempt at a Solution

I really am not sure! I look at this and i know that the reason must be obvious and I'll kick myself for not getting it but i'm simply at a loss! The only thing i can think of right now is that the fields are perpendicular to the motion and will cancel out however this just doesn't make sense!

Any help would be appreciated in not just helping me find the answer but for helping me rid myself of the stupidity i'm feeling! Thanks