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Electrostatics

Quick practice

Question 1 of 5

A beam contains 2 \times 10^{8} doubly charged positive ions per cubic centimeter, all of which are moving with a speed of 10^{5} \ \mathrm{m} / \mathrm{s} .The current density is

A

6.4 \ \mathrm{A} / \mathrm{m}^{2}

B

None of these

C

1.6 \ \mathrm{A} / \mathrm{m}^{2}

D

3.2 \ \mathrm{A} / \mathrm{m}^{2}

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