# Accelerating an electron in a betatron

In a betatron, electrons move in circular orbits and are accelerated by a time dependent magnetic field, perpendicular to the plane of the orbits. Suppose that the flux through an orbit of radius $$r=25 \textrm{cm}$$ grows during the acceleration time at a constant rate of $$\frac{d\Phi}{dt}=5 \textrm{Wb/s}$$. In the acceleration process an electron in this orbit, acquires a kinetic energy $$\Delta{E_{k}}=25 \textrm{MeV}$$. Find the distance covered in meters by the electron during the acceleration time. Keep in mind that that the radius of the electron's orbit does not change.

Details and assumptions

$e= 1.6 \times 10^{-19} C$ $1\textrm{eV}= 1.6 \times 10^{-19} \textrm{J}$

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