Question
Physics Question on mechanical properties of solids
: Young's modulus for a perfectly plastic body is zero. : For a perfectly plastic body restoring force is zero
A
If both assertion and reason are true and the reason is the correct explanation of the assertion
B
If both assertion and reason are true but reason is not the correct explanation of the assertion
C
If assertion is true but reason is false
D
If assertion is false but reason is true
Answer
If both assertion and reason are true and the reason is the correct explanation of the assertion
Explanation
Solution
Young's Modulus= (restoring force per unit area)/(elongation of wire/length of wire) now for a plastic body the restoring force is zero and it ultimately makes the Young's modulus zero. hence both assertion and reason are true