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Longitudinal Strain

In case of st...

Question

In case of steel wire (or a metal wire), the yield limit is reached when :

A

the wire just break.

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B

the load is more than the weight of wire.

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C

elongation is no longer proportional to the tension.

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D

none of these.

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Solution

The correct option is B elongation is no longer proportional to the tension.
According to Hooke's Law, within the elastic limits stress is directly proportional to strain. Therefore, the yield limit is reached when elongation is no longer proportional to strain.

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