A \( 1 \mu \mathrm{A} \) beam of protons with a cross-sectional area of \( 0.5 \) sq. mm is movi...

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A \( 1 \mu \mathrm{A} \) beam of protons with a cross-sectional area of \( 0.5 \) sq. mm is moving with a velocity of \( 3 \times 10^{4} \mathrm{~ms}^{-1} \). Then charge density of beam is
(A) \( 6.6 \times 10^{-4} \mathrm{C} / \mathrm{m}^{3} \)
(B) \( 6.6 \times 10^{-5} \mathrm{C} / \mathrm{m}^{3} \)
(C) \( 6.6 \times 10^{-6} \mathrm{C} / \mathrm{m}^{3} \)
(D) None of these
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