Saturday

February 28, 2015

February 28, 2015

Posted by **Jenny** on Friday, February 8, 2008 at 1:51am.

- Physics -
**Quidditch**, Friday, February 8, 2008 at 2:22amThe formula for resistance is:

total resistance = (resistivity) * (length)/(area)

filling in from the problem statement:

0.32 ohms = (resistivity) * 1m/(area)

looking up the resistivity for tungsten:

at 20 C

restivity = 5.28 * 10^-8 ohms*m

leaving just the area unknown:

0.32 ohm = (5.28 * 10^-8)(ohm-m) * (1 m)/(area)

Solve for the area. Then, assuming a round wire, find the diameter that gives that area.

**Answer this Question**

**Related Questions**

physics - what is the diameter of a 1.00 m length of tungsten wire whose ...

physics - the resistance of copper wire of length 1m is 0.1 ohm the diameter of ...

Math - The electrical resistance of a wire is directly proportional to its ...

Physics - For voltage variation with length, in using a slide meter, the wire ...

PHYSICS - A wire of initial length Lo and radius rO has a measured resistance of...

Physics - Two wires with the same resistance have the same diameter but ...

Material Science - Pure copper wire of diameter = 2.0 mm has an electrical ...

Math - The resistance(r)of a wire varies directly as the length(L)of the wire ...

physics - two copper wires A and B are of the same length. If the diameter of A ...

engr 109 - Calculate the resistance of a 1 mile length of wire if the ...