1. The problem statement, all variables and given/known data The net charge in a current-carrying wire is zero.Then,why does a magnetic field exert a force on it? 2. Relevant equations dF=I*dl x B 3. The attempt at a solution if we take a small portion of wire the net charge is zero,so if i take the frame of electrons that is im moving so i have a charge with me..and i get a force due to it..i dont know weather my explanation was correct or wrong?? dont go to lorentz transformation to explain..(in case needed)..because i dont have the idea of relativity theory in maxwell equations..im saying this because i had read many post on similar kind of topic where every one finally explained with lorentz transformation..saying that in one frame its magnetism..its electricity in another frame..