A) 4 : 1
B) 1 : 4
C) 2 : 1
D) 1 : 2
Correct Answer: C
Solution :
\[r=\frac{mv}{qB}\Rightarrow \frac{{{r}_{\alpha }}}{{{r}_{p}}}=\frac{{{m}_{\alpha }}}{{{m}_{p}}}\times \frac{{{q}_{p}}}{{{q}_{\alpha }}}=\frac{4}{1}\times \frac{1}{2}=\frac{2}{1}\]
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