An Electron Beam Contains 1 $\times$ 10¹⁷ Electrons Per M³ and Is Confined to Circular Region

question 47

Multiple Choice

An electron beam contains 1.5 $\times$ 10¹⁷ electrons per m³ and is confined to circular region of diameter 0.025 mm.The electrons in the beam are extremely energetic,and travel at nearly the speed of light.What is the current in the beam?

• A) 1.4 A
• B) 3.5 mA
• C) 350 mA
• D) 14 mA

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