The aurora is caused when electrons and protons, moving in the earth's magnetic field of ~~$5\mathrm{.}0{10}^{-5}T,$ collide with molecules of the atmosphere and cause them to glow.

Part A

What is the radius of the circular orbit for an electron with speed $3\mathrm{.}0{10}^6\frac{m}{s}?$ Assume that the electron moves in a plane perpendicular to the magnetic field. Express your answer with the appropriate units.

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Part B

What is the radius of the circular orbit for a proton with speed $4\mathrm{.}0{10}^4\frac{m}{s}?$

Express your answer with the approprlate units.

$r_{\text{p}\text{r}\text{o}\text{t}\text{e}\text{n}}$

$r_{\text{p}\text{r}\text{o}\text{t}\text{o}\text{n}}=$

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