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JEE Main Physics question

PhysicsMechanical Properties of SolidsJEE Main

A 45-kg traffic light is suspended with two steel wires of equal lengths and radii 0.5 cm. If the wires make an angle of with the horizontal, the fractional increase in their length due to the weight of the traffic light is . Find C. (Young's modulus of steel , and )

Answer: 2.81

Solution

Vertical equilibrium: (since ). Area $=π

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Question ID VK-155204