Answer to Question #259381 in Electricity and Magnetism for oyube

Question #259381

What uniform magnetic field must be set up in space to permit a proton of speed 1.0x10^7 m/s to move in a circle the size of the earth’s equator? (R = 6400 km)

Expert's answer

We know that

$R=\frac{mv}{qB}$

$B=\frac{mv}{qR}$

B=\frac{1.6\times10^{-27}\times10^7}{1.6\times10^{-19}\times64\times10^5}=1.63\times10^{-8}T

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