${H^ + },\,H{e^ + }$ and ${O^{ + + }}$ ions having same kinetic energy pass through a region of space filled with uniform magnetic field $B$ directed perpendicular to the velocity of ions. The masses of the ions ${H^ + },\,H{e^ + }$and ${O^{ + + }}$ are respectively in the ratio $1:4:16$. As a result
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(d) $r \propto \frac{{\sqrt m }}{q}$$ \Rightarrow {r_H}:{r_{He}}:{r_o} = \frac{{\sqrt 1 }}{1}:\frac{{\sqrt 4 }}{1}:\frac{{\sqrt {16} }}{2} = 1:2:2$
Radius is smallest for ${H^ + }$, so it is deflected most.
Radius is smallest for ${H^ + }$, so it is deflected most.
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