Question: #20, explain steps please Section 26.3 Charged Particles in Magnetic Fields 20. Find the radius of the path described by a proton moving at 15

#20, explain steps please

Section 26.3 Charged Particles in Magnetic Fields 20. Find the radius of the path described by a proton moving at 15 km/s in a plane perpendicular to a 400-G magnetic field. 21. How long does it take an electron to complete a circular orbit

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