Home Physics JEE Main Full Syllabus Mock Test 75 Question New Syllabus TEST 15 PCM A copper wire of length 1.0 m and a steel wi…
Physics JEE Main Full Syllabus Mock Test 75 Question New Syllabus TEST 15 PCM MCQ (Single Correct)

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 stretched the copper wire by 1 mm. If the Young's modulii of copper and steel are respectively and , the total extension of the composite wire is

A
1.75 mm
B
2.0 mm
C
1.50 mm
D
1.25 mm

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Text Solution

Verified by Experts
The correct answer is:
D

When a wire of length L, cross-sectional area A and Young's modulus Y is stretched with a force F, the extension I in the wire is given by

Since F and A are the same for the two wires, we have

For copper wire
For steel wire

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