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## Homework Statement

A wire of diameter 0.2mm stretches by 0.20% when a 6.28-N force is applied. What is the elastic modulus of the wire?

## Homework Equations

Elastic Modulus=F/A/L/[tex]\Delta[/tex]L

## The Attempt at a Solution

r=.1mm=1x10

^{-4}m

6.28N/(2[tex]\pi[/tex]1x10

^{-8}/.02=5x10

^{9}N/m

^{2}

The right answer is 1.0x10

^{11}.

What am I doing wrong?