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AP® Physics C: E & M

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Kinetic Energy of a Particle Experiencing Magnetic Force

APPHEM-YWSNNO

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

The Kinetic Energy of the electron can be described by the expression

A

$\mathit{\frac{1}{2} m_e v^2}$

B

$\mathit{evBr}$

C

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

D

$\mathit{2evBr}$

E

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