Copper Has 8 $\times$ 10²⁸ Current Carrying Electrons Per M³ $\times$ 10^-6 M/s

question 28

Multiple Choice

Copper has 8.5 $\times$ 10²⁸ current carrying electrons per m³.A copper wire carries a current of 17 mA,and the drift velocity of the electrons is measured to be 18 $\times$ 10^-6 m/s.What is the wire radius?

• A) 0.15 mm
• B) 0.27 mm
• C) 2.7 mm
• D) 1.5 mm

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