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Question
In case of steel wire or a metal wire, the elastic limit is reached when :
In case of steel wire or a metal wire, the elastic limit is reached when :
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Solution
The correct option is C Elongation is inversely proportional to the tension
According to Hooke's law, the stress produced in a body is proportional to the strain. But this proportionality exists for small strains only. When a load is applied to a damped wire, the length of wire goes on increasing part OA of the graph is straight line, indicating that upto point A increase in length is directly proportional to load. After point A on further increasing the load, the increase in length is no longer proportional to load, however till point B, the elastic property exists in the wire. The stress at point B is called elastic limit. Beyond B is the wire does not return to its original position, but its length is permanently increased.
According to Hooke's law, the stress produced in a body is proportional to the strain. But this proportionality exists for small strains only. When a load is applied to a damped wire, the length of wire goes on increasing part OA of the graph is straight line, indicating that upto point A increase in length is directly proportional to load. After point A on further increasing the load, the increase in length is no longer proportional to load, however till point B, the elastic property exists in the wire. The stress at point B is called elastic limit. Beyond B is the wire does not return to its original position, but its length is permanently increased.
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