If the ratio of time periods of circular motion of two charged part...

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If the ratio of time periods of circular motion of two charged particles in magnetic field is \( 1 / 2 \), then the ratio of their
\( \mathrm{P} \) kinetic energies must be :

W
(A) \( 1: \sqrt{2} \)
(B) \( \sqrt{2}: 1 \)
(C) \( 2: 1 \)
(D) It can have any value
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