A uniform magnetic field B exists in a region. An electron is given...

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A uniform magnetic field B exists in a region. An electron is given velocity perpendicular to the magnetic field.Assuming Bohr's quantization rule for angular momentum.
Calculate the radius of the nth orbit
(A) \( \sqrt{\frac{\mathrm{nh}}{2 \pi \mathrm{eB}}} \)
(B) \( \sqrt{\frac{n h e B}{2 \pi}} \)
(C) \( \sqrt{\frac{n h e}{2 \pi B}} \)
(D) \( \sqrt{\frac{\mathrm{nhB}}{2 \pi \mathrm{e}}} \)
\( \mathrm{P} \)
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