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Author Question: The electron density in copper is 8.49 1028 electrons/m3. The electron charge is e = 1.60 1019 C. ... (Read 139 times)

cool

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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?

1.6

1.3

0.62

0.79

0.88


Question 2

The electron density in copper is 8.49 × 1028 electrons/m3. The electron charge is e = 1.60 × 1019 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

1.84 × 106.

+1.84 × 106.

1.84.

5.43 × 105.

+5.43 × 105.


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Marked as best answer by cool on Aug 6, 2020

gcook

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cool

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Reply 2 on: Aug 6, 2020
YES! Correct, THANKS for helping me on my review


cpetit11

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Reply 3 on: Yesterday
Wow, this really help

 

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