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  4. If a proton enters perpendicularly a magnetic field with velocity v, then time period of revolution is T. If proton enters with velocity 2 v, then time period will be

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Q. If a proton enters perpendicularly a magnetic field with velocity $v$, then time period of revolution is $T$. If proton enters with velocity $2 v$, then time period will be

Moving Charges and Magnetism

Solution:

$T=\frac{2 \pi m}{q B} \Rightarrow $ independent of $v$