1.

In cyclotron, an ion is made to travel successively along semicircles of increasing radius under the action of a magnetic field. The angular velocity of the ion is independent ofA. speed of ionB. radius of the circleC. mass of the ionD. charge of the ion

Answer» Correct Answer - B
Here, as wer know is cyclotron centripetal force on charge is equal to magnetic force `F_c=F_m`
So `(mv^2)/(r)=qvBimpliesv/r=(qB)/(m)`
[As `v=romega`, So `V/r=omega`]
So `omega=(qB)/(m)` [i.e., Independent of v, r]


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