(Solution) - An electron is accelerated from rest through potential differenc -(2025 Original AI-Free Solution)

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An electron is accelerated from 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 set by rs = 3.0 mm, and the horizontal axis scale is set by Vs1/2 = 40.0 V1/2. What is the magnitude of the magneticfield?