According to my text book:
The Lorentz Force F on a charged particle moving in an electromagnetic field is given by:
$$F= qE + q(v\times B)$$
then it states that "it is to be pointed out that only the electric force does work, while the no work is done by the magnetic force which is simply a deflecting force."
How can this by true won't the the magnetic force have a considerable magnitude, will it now impart kinetic energy to the charge? Any explanations will help a lot. Please keep the terminology simple, thanks.