q29:

29. H⁺, He⁺ and O⁺⁺ are projected in uniform transverse field with equal accelerating potential, then ratio of their radii are respectively if their masses are 1 a.m.u., 4 a.m.u. and 16 a.m.u. respectively:-

$$\begin{gathered} \left(1\right) 1 : \sqrt{2} : 2\sqrt{2} \left(2\right) 1 : \sqrt{2} : \sqrt{2} \\ \left(3\right) 1 : 2 : 2\sqrt{2} \left(4\right) \sqrt{2} : 2 : 1 \end{gathered}$$