Homework Answers
we have given the accelerating voltages = 500eV and the magnetic field B = 0.01 T.
Approach first we will see the kinetic energy gained by the electron. Classically, we will calculate the velocity of electron.
As soon it eneterd in the region of magnetic field the Lorenz force will act which make it to move in circular path. So the magnetic force will provide the required centripetal force.
From there we can calculate the radius of circular path, but we
have to calculate the value of (d) which is actually the diameter
so d =2R. 
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