A Wire of Radius 0 $\times$ 10^-6 M/s $\times$ 10²⁹ M^-3
B) 4

question 17

Multiple Choice

A wire of radius 0.15 mm is made of an unknown metal and carries a current of 8.4 mA.The drift velocity for electrons in the wire is measured to be 36 $\times$ 10^-6 m/s.What is the carrier density of the metal from which the wire is made?

• A) 1.3 \(\times\) 10²⁹ m^-3
• B) 4.2 \(\times\) 10²⁸ m^-3
• C) need more information to do this calculation.
• D) 4.2 \(\times\) 10³⁰ m^-3

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