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

The Young's modulus of brass and steel are respectively `1.0 xx 10^(11) Nm^(-2)` and `2.0 xx 10^(11) Nm^(-2)`. A brass wire and a steel wire of the same length are extended by 1 mm each under the same force. If radii of bras and steel wires are `R_(B)` and `R_(s)` respectively, then

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