Q. Given below are two statements : One is labelled as Assertion (A) and the other is labelled as Reason (R) Assertion (A) : The stretching of a spring is determined by the shear modulus of the material of the spring Reason (R) : A coil spring of copper has more tensile strength than a steel spring of same dimensions. In the light of the above statements, choose the most appropriate answer from the options given below :
A) (A) is false but (R) is true
B) Both (A) and (R) are true and (R) is the correct explanation of (A)
C) Both (A) and (R) are true and (R) is not the correct explanation of (A)
D) (A) is true but (R) is false
Explanation
[Solution] Stretching a coil spring twists the wire, so it depends on the shear modulus (A true). Steel has greater elasticity/tensile strength than copper (R false). Answer (4).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.