Keeping the length of a wire unchanged, ...

Keeping the length of a wire unchanged, its diameter is doubled. Young's modulus for the material of the wire will

increase

decrease

remain the same

none of these

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When a load of 10 kg is hung from one end of a wire of length 5 m, the wire elongates by 5 mm. IF the young modulus for the material of the wire is 9.8 times 10^10 N.m^-2 , then find the area of cross section of the wire. [g=9.8 m.s^-2 ]

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A load of 20 kg is hung from one end of a wire of length 6 m and of cross sectional area 1mm^2 . IF the load is withdrawn, the length of the wire becomes 5.995 m. Calculate the (i) longitudinal strain, (ii) longitudinal stress and (iii) Young's modulus for the material of the wire.

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