Which of these particles will have minimum frequency of revolution when projected with the same velocity perpendicular to a magnetic field ?

proton

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α

partcle

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neutron

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electron

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Solution

The correct option is D electron
When a charged particle of charge 'q' and man 'm' is projected to a
magnetic field in perpendicular to $\to B$ , it revolves with a frequency of:-
$V = \frac{B q}{2 π m}$
Hence , a large charge /man (q/m) ratio means higher frequency
out of $4$ option an electrons has highest q/m ratio ,using to its low man
$∴$ The electron will have highest frequency

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