# Kinetic Energy's Effect on Electron's Radius in Magnetic Field

by mirandab17
Tags: electromagnetism, electron, magnetism, radius
 P: 40 An electron moves in a circular orbit of radius r in a magnetic field. The electron moves in a path perpendicular to the magnetic field. If the kinetic energy of the electron is doubled, what is the new radius of its path? What formula would I use to go about this? Is this about mass spectrum? So I would go about using Fnet=ma, and then Fb (of a single charge) = mv^2/r. So Bvq = mv^2/r... then where? Please help! Test tomorrow! :(
P: 317
 Quote by mirandab17 An electron moves in a circular orbit of radius r in a magnetic field. The electron moves in a path perpendicular to the magnetic field. If the kinetic energy of the electron is doubled, what is the new radius of its path? What formula would I use to go about this? Is this about mass spectrum? So I would go about using Fnet=ma, and then Fb (of a single charge) = mv^2/r. So Bvq = mv^2/r... then where? Please help! Test tomorrow! :(
Sure, you're on the right track. Use that to solve for $r$ first. Then think about which quantity in the equation for the radius will change if the kinetic energy is doubled, and figure out how much it will be changed by.

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