An \( \alpha \)-particle with a specific charge of \( 2.5 \times 10...

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An \( \alpha \)-particle with a specific charge of \( 2.5 \times 10^{7} \mathrm{C} / \mathrm{kg} \) moves with a speed of \( 2 \times 10^{5} \mathrm{~ms}^{-1} \) in a perpendicular magnetic field of \( 0.05 \mathrm{~T} \). The radius of circular path - described by the particle is
- (a) \( 8 \mathrm{~cm} \)
(b) \( 4 \mathrm{~cm} \)
(c) \( 16 \mathrm{~cm} \)
(d) \( 2 \mathrm{~cm} \)
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