Question

two ions having masses 1:1 and charges 1:2 are projected into uniformmagnetic field perpendicular to the field with speeds in the ratio 2:3.the ratio of the radii of circular along which the two particle move is

Answer 1

Centripetal force is provided by magnetic force , so qvB=mv^2/r

So r is given by mv/qB

So radius of 1st particle is m2v/qB and for 2nd particle, m3v/2qB

Now the ratio, after solving , is 4/3