A copper wire of length 2.2 m and a steel wire of length 1.6 m, both of diameter 3.0 mm are connected end-to-end. When stretched by a load, the net elongation is found to be 0.70 mm. The load applied (in N) is
(Take, 
)
Text Solution
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The copper and steel wires are under a tensile stress because they have the same tension
(equal to the load 
and the same area of cross-section A.
Stress 
Strain 
Young's modulus
where, the subscripts C and S refer to copper and stainless steel, respectively.
… (i)
Given,
The total elongation is given to be
… (ii)
Solving Eqs. (i) and (ii), we get
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