Motion in Magnetic Fields question

A small particle accelerator for accelerating ^{6} Be ^+ ions is shown in the figure. The ^{6} Be ^+ ions exit the ion source with a kinetic energy of 20 keV.
Regions 1 and 3 contain magnetic fields directed into the page which bend the beam around. The magnetic field in region 1, |\vec{B_1}|, is equal to 1 T.
Region 2 has a width y=0.5m and contains an electric field |\vec{E_2}| = 60 kV/m directed from left to right, which accelerates the particles.
The ^{6} Be ^+ ion beam exits the accelerator a distance z = 7.6 cm above the ion source, as sho

Question

Motion in Magnetic Fields question

A small particle accelerator for accelerating  ^{6} Be ^+ ions is shown in the figure. The ^{6} Be ^+ ions exit the ion source with a kinetic energy of 20 keV. 
Regions 1 and 3 contain magnetic fields directed into the page which bend the beam around. The magnetic field in region 1, |\vec{B_1}|, is equal to 1 T.
Region 2 has a width y=0.5m and contains an electric field |\vec{E_2}| = 60 kV/m directed from left to right, which accelerates the particles.
The ^{6} Be ^+ ion beam exits the accelerator a distance z = 7.6 cm above the ion source, as sho

anonymous · Answer

i already got question a) and attempted to do b by using formula x=2r = 2mv/qB