If a beam of charged particles moving with speed \( 3 x \) \( 106 \...

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If a beam of charged particles moving with speed \( 3 x \) \( 106 \mathrm{~m} / \mathrm{s} \) enters normally into a region of uniform magnetic field \( 90 \mathrm{mT} \) and specific charge of each particle is \( 108 \mathrm{C} / \mathrm{kg} \), then the radius of the circular path described by it will be
(1) \( 0.33 \mathrm{~m} \)
(2) \( 0.57 \mathrm{~m} \)
(3) \( 0.82 \mathrm{~m} \)
(4) \( 1.25 \mathrm{~m} \)
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