Copper has 8.5 × 10²⁸ current-carrying electrons per m³. A copper wire of radius 0.15 mm carries a current of 17 mA. What is the average drift velocity for the electrons? A) 2.7 × 10⁻⁹ m/s B) 56 × 10⁻⁶ m/s C) 18 × 10⁻⁶ m/s D) more information is needed for this calculation

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The drift velocity can be calculated using the formula $ v_d = \frac{I}{nAe} $, where $ I $ is the current, $ n $ is the number of electrons per unit volume, $ A $ is the cross-sectional area, and $ e $ is the charge of an electron. Substituting the given values, the drift velocity is approximately 18 × 10⁻⁶ m/s.

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