1. The problem statement, all variables and given/known data Ions with mass m and charge q are accelerated through a potential difference V. They then enter a uniform magnetic field perpendicular to their velocity and are deflected in a semicircular path of radius R What potential difference V is needed so that singly ionized 12C atoms will have R= 50 cm in a 0.15T magnetic field? radius R= 50 cm magnetic field strength B= 0.15 T mass m= 1.993 X10^-26 kg charge q=? linear velocity v=? voltage difference V=? 2. Relevant equations v=(R*|q|*B)/m V=(0.5*m*v^2)/q Not looking for a specific solution from here. I need a new way to equate the data. No matter how I slice it given the formulas and data provided, I cannot find the potential difference without either the particle's charge or its linear velocity.