Calculating Resistivity: Finding the Area of a Wire

sphys4 · Jun 21, 2011

Homework Statement

A wire has a diameter of 1.51 mm and a length of 32.7 m, and is found to have a resistance of 1.5 capital omega. What is the resistivity of the wire?

R=qL/A
R=.0051/2=7.55E-4
L=32.7
A = ?
How do i find A to plug into the equation to find q?

rl.bhat · Jun 21, 2011

In the formula R = resistance of the wire, A, the area of the cross section of the wire = π*r^2, where r is the radius of the wire = diameter/2.