Answer:
tensile stress = 55 x 10⁷ Pa
Step-by-step explanation:
given,
radius of the copper wire = 4.1 mm = 0.0041 m
the wire stretches = 5.0×10⁻³ l
l = original length
young's modulus of copper = 11 x 10¹⁰ Pa
strain =



tensile stress = young's modulus x strain
tensile stress = 11 x 10¹⁰ x 5.0×10⁻³
tensile stress = 55 x 10⁷ Pa
The tensile stress on the wire is equal to 55 x 10⁷ Pa