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Counter-Strike: Source (2004)

Duration: 6:55

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A particle of specific charge \( \frac{q}{m}=\pi \mathrm{C} / \mathrm{kg} \) is projected from the origin towards positive \( x \)-axis with a velocity of \( 10 \mathrm{~m} / \mathrm{s} \) in a uniform magnetic field \( \vec{B}=-2 \hat{k} \mathrm{~T} \). The velocity \( \vec{v} \) of particle after time \( t=\frac{1}{12} \mathrm{~s} \) will be (in \( \left.\mathrm{m} / \mathrm{s}\right) \)
(A) \( 5[\hat{i}+\sqrt{3} \hat{j}] \)
(B) \( 5(\sqrt{3} \hat{i}+\hat{j}) \)
(C) \( 5[\sqrt{3} \hat{i}-\hat{j}] \)
(D) \( 5[\hat{i}+\hat{j}] \)
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