An electron beam with cross-section area 1.0 mm2 has 6 × 1016 electrons (q= 1.6 × 10-19 C) passing per second perpendicular to any section. The current density (ampere per metre2) in the beam is:
1
9.6 × 10-3
2
9.6
3
9.6 × 103
4
9.6 × 102
5
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