a)find the charge to mass ratio for an electron accelerated through 600v in a magnetic field of strength 45mT where the speed of the electrons is 1.4*10^7m/s

b)what is the percentage difference b/n your result and the accepted ratio with the value q=1.6*10^-19C and m=9.11*10^-13kg

Not really sure why charge, voltage and the magnetic field is a part of this problem. As far as I know there are no relativistic effects on charge (Bob, help me out here).

I believe I can express relativistic mass as
m = m/(sqrt(1-v^2/c^2))

Oh and that mass of an electron is wrong. It's 9.11e-31