Physics Elasticity Question 122
Question: A copper wire and a steel wire of the same diameter and length are connected end to end and a force is applied, which stretches their combined length by 1 cm. The two wires will have
[MP PMT 1992]
Options:
A) Different types of stress and strain
B) The same stress and strain occurs
C) The same strain but different stresses
D) The same stress but different strains
Show Answer
Answer:
Correct Answer: D
Solution:
$ \rho=\frac{F}{A} $ . In the present case, force applied and area of cross-section of wires are same,
Therefore stress has to be the same. $ \sigma=\frac{F}{A} $ Since the Young’s modulus of steel wire is greater than the copper wire, therefore, strain in case of steel wire is less than that in case of copper wire.
BETA
