A narrow beam of protons produces a current of

PHYSICS · Single correct · CBSE · Physics · Current Electricity · Current Electricity

Problem

31. A narrow beam of protons produces a current of

1.6 \times 10^{-3} \mathrm{~A}

. There are

10^{9}

protons in each meter along the beam. Of the following, which is the best estimate of the average speed of the protons in the beam? (A)

10^{-15} \mathrm{~m} / \mathrm{s}

(B)

10^{-12} \mathrm{~m} / \mathrm{s}

(C)

10^{-7} \mathrm{~m} / \mathrm{s}

(D)

10^{7} \mathrm{~m} / \mathrm{s}