JEE Main 2013 Physics question
A copper wire of length 1.0 m and a steel wire of length 0.5 m having equal cross-sectional areas are joined end to end. The composite wire is stretched by a certain load which stretches the copper wire by 1 mm. If the Young's moduli of copper and steel are respectively and , the total extension of the composite wire is :
Answer: (4)
Solution
Both wires carry the same tension and have the same area, so the stress is the same. Copper: $ FA = =
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