Q13 of 29 Page 68

A copper and a steel wire of the same diameter are connected end to end. A deforming force F is applied to this composite wire which causes a total elongation of 1cm. The two wires will have

Since, stress depends on the deforming force and the area of the object, they both will experience same stress because they have the same diameter and are subject to same deforming force.

Since, both these wires are made up of different materials, thus, they will have different elongations, leading to different strain.

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11

A rod of length l and negligible mass is suspended at its two ends by two wires of steel (wire A) and aluminium (wire B) of equal lengths (Fig. 9.4). The cross-sectional areas of wires A and B are 1.0 mm2 and 2.0 mm2, respectively

(YAI = 70 X 109 Nm-2 and Ysteel = 200 X 109 Nm-2)



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The Young’s modulus for steel is much more than that for rubber. For the same longitudinal strain, which one will have greater tensile stress?

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Is stress a vector quantity?