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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:-

$\left(1\right)1:\sqrt{2}:2\sqrt{2}\left(2\right)1:\sqrt{2}:\sqrt{2}\phantom{\rule{0ex}{0ex}}\phantom{\rule{0ex}{0ex}}\left(3\right)1:2:2\sqrt{2}\left(4\right)\sqrt{2}:2:1$

Refer to the link below for the answer to a similar query,

https://www.meritnation.com/ask-answer/question/a-proton-a-deuteron-and-particle-are-accelerate/moving-charges-and-magnetism/10548027

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