Calculate Min Drum Diameter for Copper Strip 4mm Thick, max Stress 332MN/m2

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Homework Statement


3. Calculate the minimum diameter of drum on which copper strip 4mm thick may be wound if the maximum bending stress is not to exceed 332MN/m2.
Assume E = 95 GN/m2


σ /(yxE)=r

Homework Equations





The Attempt at a Solution



would this work if so i make it 1.7m aprox
 
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I believe you need to invert that answer. The form I am used to seeing is

[tex]\frac{1}{\rho}=\frac{\sigma_{max}}{E*c}[/tex]

Where rho is the radius of curvature.