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

Question 47

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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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