Assertion (A) : Young's modulus for a perfectly plastic body is zero. Reason (R) : For a perfectly plastic body, restoring force is zero.
Both assertion and reason are true, but reason is not correct explanation of the assertion
Assertion is false, but the reason is true
Both assertion and reason are true and the reason is correct explanation of the assertion
Assertion is true, but the reason is false
A
Both assertion and reason are true and the reason is correct explanation of the assertion
B
Assertion is true, but the reason is false
C
Both assertion and reason are true, but reason is not correct explanation of the assertion
D
Assertion is false, but the reason is true
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Solution
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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
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