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An electron of charge $e$ and mass $m_e$ moves in a circular path of radius $r$ in a uniform magnetic field $B$.

Using the information above, the kinetic energy of the electron can be described by which of the following expressions?

$\mathrm{ m_e v^2}$

$\mathrm{evBr}$

$\mathrm{\frac{1}{2}evBr}$

$\mathrm{2evBr}$

$\mathrm{\sqrt{\frac{1}{2}evBr}}$