Comprehension A uniform magnetic field \( B \) exists in a region. An electron is given velocity...

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Comprehension
A uniform magnetic field \( B \) exists in a region. An electron is given velocity perpendicular to the magnetic field. Assuming Bohrs quantization rule for angular momentum.
Calculate the minimum possible speed of the electron.
(a) \( \sqrt{\frac{h e B}{n m^{2}}} \)
(b) \( \sqrt{\frac{h e}{2 \pi B m^{2}}} \)
(c) \( \sqrt{\frac{h e B}{2 \pi m^{2}}} \)
(d) \( \sqrt{\frac{h e m^{2}}{2 \pi B}} \)
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