Electron in a magnetic field

1. The problem statement, all variables and given/known data

An electron is accelerated from rest through a potential difference V and then enters a uniform magnetic field oriented perpendicular to its path. The field deflects the particle into a circular arc of radius R. If the accelerating potential is tripled to 3V, what will be the radius of the circular arc?

2. Relevant equations


3. The attempt at a solution

The answer is √3 R, just not sure how to get there


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