What is the value of \( B\left(\right. \) in \( \left.\times 10^{-8} \mathrm{~T}\right) \) that ...

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What is the value of \( B\left(\right. \) in \( \left.\times 10^{-8} \mathrm{~T}\right) \) that can be set up at the equator to permit a proton of speed \( 10^{7} \mathrm{~m} / \mathrm{s} \) to circulate around the earth?
\[
\left[R=6.4 \times 10^{6} \mathrm{~m}, m_{P}=1.67 \times 10^{-27} \mathrm{~kg}\right]
\]
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