apply centripetal force = magnetic force
i.e mv^2/r = qvB,
where m = mass o the charged particle
v = velocity, r = radius ,
q = charge = 1.6*10^-19 C
B = magnetic field
so now , r = mv/qB
also KE = PE
0.5 mv^2 = eV
or v = sqrt(2eV/m)
r = (m/qB) sqrt(2eV/m)
so r = sqrt(2mV/qB^2)
so r is directly proprotional to sqrt m
so rA/rB = sqrt(ma/mb)
rA/rBv = sqrt(2)
option 2 it is
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