Author Question: The electron density in copper is 8.49 1028 electrons/m3. The electron charge is e = 1.60 1019 C. ... (Read 189 times)

cool · **on:** Aug 6, 2020

Question 1

Most telephone cables are made of copper wire of either 24 or 26 gauge. If the resistance of 24-gauge wire is 137 Ω/mile and the resistance of 26-gauge wire is 220 Ω/mile, what is the ratio of the diameter of 24-gauge wire to that of 26-gauge wire?

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1.6

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1.3

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0.62

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0.79

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0.88

Question 2

The electron density in copper is 8.49 × 10²⁸ electrons/m³. The electron charge is e = −1.60 × 10⁻¹⁹ C. When a 1.00 A current is present in a copper wire with a 0.40 cm² cross-section, the electron drift velocity, in m/s, with direction defined relative to the current density, is

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−1.84 × 10⁻⁶.

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+1.84 × 10⁻⁶.

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−1.84.

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−5.43 × 10⁵.

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+5.43 × 10⁵.

gcook · **Reply #1 on:** Aug 6, 2020

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