A Wire of Radius 0

question 33

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 × 10⁻⁶ m/s. What is the charge carrier density of the metal from which the wire is made?

• A) 1.3 × 10²⁹ m⁻³
• B) 2.1 × 10²⁸ m⁻³
• C) need more information to do this calculation.
• D) 4.2 × 10³⁰ m⁻³