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April 19, 2014

April 19, 2014

Posted by **Emma** on Monday, November 19, 2012 at 2:33pm.

resistivity of the material is measured to be 11 x 10-8 ohms/m and the density is 7.86 g/cm3. The

material is to be shaped into a solid cylindrical wire that has a total resistance of 1.5 ohms.

a) What length of wire is required?

b) What must be the diameter of the wire?

- physics, university -
**Elena**, Monday, November 19, 2012 at 3:03pmm=0.05 kg, ρ =11•10⁻⁸ Ω/m

d=7860 kg/m³ R=1.5Ω

R= ρ•L/A

d=m/V=m/A•L

R/d= ρ•L²•A/A•m = ρ•L²/m.

L=sqrt{m•R/ρ•}=…

A= ρ•L/R = …

A=πD²/4

D=sqrt(4A/π)=…

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