Answer:
kinetic energy does not change
Explanation:
you can use the formula for the kinetic energy of the electron and for the radius of the trajectory of an electron in a uniform magnetic field:
[tex]E_k=\frac{1}{2}m_ev^2\\\\r=\frac{m_e v}{qB}[/tex]
me: mass of the electron
B: magnetic field
q: charge of the electron
r: radius
By doing v the subject of the formula and replace it in the expression for the kinetic energy you obtain:
[tex]v=\frac{rqB}{m_e}\\\\E_k=\frac{1}{2}m_e(\frac{rqB}{m_e})^2=\frac{r^2q^2B^2}{2m_e}[/tex]
as youcan see, all parameters r, q, B and me are constant.
hence, the kinetic energy does not change
