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Problem: The resistivity of gold is 2.44 x 10 -8 Ω•m at a temperature of 20°C. A gold wire, 1.8 mm in diameter and 14 cm long, carries a current of 480 ma. The power dissipated in the wire is closest to: A) 0.077 mW B) 0.25 mW C) 0.14 mW D) 0.19 mW E) 0.31 mW

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Problem Details

The resistivity of gold is 2.44 x 10 -8 Ω•m at a temperature of 20°C. A gold wire, 1.8 mm in diameter and 14 cm long, carries a current of 480 ma. The power dissipated in the wire is closest to:

A) 0.077 mW

B) 0.25 mW

C) 0.14 mW

D) 0.19 mW

E) 0.31 mW

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What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Power in Circuits concept. You can view video lessons to learn Power in Circuits. Or if you need more Power in Circuits practice, you can also practice Power in Circuits practice problems.

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Our expert Physics tutor, Douglas took 5 minutes and 26 seconds to solve this problem. You can follow their steps in the video explanation above.

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Based on our data, we think this problem is relevant for Professor Bratton's class at CSUS.