The force required to stretch a steel wire 1 sq. cm in cross section to double its length is (given y=2×10^11N/m2)
Correct answer: C. 2 × 10^7 N
- A. 10^7 N
- B. 10^11N
- C. 2 × 10^7 N
- D. 2 x 10^11 N
Explanation
The force (F) required to stretch a wire can be calculated using Hooke's Law: F=Y⋅A⋅ΔL/L , where:Y is the Young's modulus,A is the cross-sectional area,ΔL is the change in length,L is the original length.Given that the cross-sectional area remains constant, we have A=1cm^2.The change in length (ΔL) is double the original length, so ΔL=2L.Substituting the values into Hooke's Law, we get: F =2×10^7N
Last updated
About Physics of Solids
Solids are compared through crystal structure, amorphous arrangement, elasticity, plastic deformation, stress, strain and Young’s modulus. Electrical behavior depends on available charge carriers and band structure, so conductors, insulators and semiconductors must be distinguished from mechanical properties such as strength, stiffness and brittleness.
Practise Physics of Solids
320 free Physics of Solids MCQs from Physics, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Exams that ask Physics questions like this
Physics is on 9 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
Related questions
A 4.0 m long wire is subjected to stretching force and its length increases by 40 cm. The percent elongation which the wire undergoes is:
A ball falling in a lake of 200 m shows a decrease of 0.1% in its volume. The bulk modulus of elasticity of the material of the ball is: (take g = 10 m/s²)
A ball falling in a lake of 200 m shows a decrease of 0.1% in its volume. The bulk modulus of elasticity of the material of the ball is: (take g =10 m/s2)
A block weighing 40 kg extends a spring by 0.16m from its unscratched position. What is the value of k?
A body floats in a liquid contained in a beaker. The whole system, as shown, falls freely under gravity. The upthrust on the body due to the liquid is: