An electron is accelerated through 1800V from rest and then enters a uniform 2.90T magnetic field. What are the maxium and minium values of the magnetic force this charge can experience? Ok someone help me out here...not sure of the equation. How do the formulas for a magnetic force differ between a line of current and a moving charge? In this case I believe the formula is Fm=QVBsin(theta). The maxium & minium force will vary with the angle measure, i.e. sin(90)=max. But how does potential difference (1800V) come in to play here? Where does the value of the magnetic field (B) come from?