The Young's modulus of iron and steel a...

The Young's modulus of iron and steel are `5xx10^10N//m^2` and `2xx10^11N//m^2` respectively. An iron wire and steel wire of same length are extended by 2 mm under the same force. If the radii of iron and steel wires are `R_I` and `R_S` respectively, then what will be the relation between `R_I` and `R_S`?

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