Question: An electron is accelerated rest through potential difference V and then enters a region of uniform magnetic field where it undergoes uniform circular motion. Figure

An electron is accelerated rest through potential difference V and then enters a region of uniform magnetic field where it undergoes uniform circular motion. Figure gives the radius r of that motion versus V1/2. The vertical axis scale is 0 set by r s = 3.0 mm, and the horizontal axis scale is set by Vs1/2 = 40.0 v1/2. What is the magnitude of the magnetic field?

VI/2 (v/2) (wu) a

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