What is the diameter of a 1.07m length of tungsten wire whose resistance is 0.43

Question

What is the diameter of a 1.07m length of tungsten wire whose resistance is 0.436Ohm? Answer: Last Answer: 1.122times10^-7 Units required, tries 0/6. A number 14 copper wire has a diameter of 1.628mm. Calculate the resistance of a 34m long piece of such wire. Use rho= 1.72x10-8 Ohm-m for the resistivity of copper. Answer: A typical household circuit is capable of carrying 15.0 A of current at 120 V before the circuit breaker will trip. How many 1500-W hair dryers can run off one such circuit? Answer: In the rush to get ready for lecture, a physics professor leaves the hair dryer described in the previous problem running and does not turn it off until he gets home 7.7 hours later. How much will this add. in dollars, to his next electric bill (assume electricity costs $0,078 per kilowatt-hr)? Answer:

Explanation / Answer

question 3:

R = L/A = L/r2 = 4 L/ D2

therefor

D = (4 L/ R) = (4*5.6e-8*1.07/(3.1416*0.436)) = 4.18e-4 m

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