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A uniform copper wire of mass 2.23xx10^(...

A uniform copper wire of mass `2.23xx10^(-3)` kg carries a current of 1 A when 1.7 volt is applied across it. Calculate its length and area of cross-section. If the wire is uniformly stretched to double its length, calculate the new resistance. Density of copper `=8.92xx10^3Kg//m^3`Resistivity is `1.7xx10^(-8)Omega-m`

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Knowledge Check

  • The area of cross section of a steel wire (Y=2.0xx10^11 N//m^2) is 0.1 cm^2 . The force required to double its length will be

    A
    (A) `2xx10^12 N`
    B
    (B) `2xx10^11 N`
    C
    (C) `2xx10^10 N`
    D
    (D) `2xx10^6 N`

  • An electric current of 16A exists in a meta! wire of cross section 10^(-6)m^2 and length 1m. Assuming one free electron per atom. The drift speed of the free electrons in the wire will be (Density of metal =5xx10^3kg//m^3 atomic weight =60)

    A
    `5xx10^(-3)m//s`
    B
    `2xx10^(-3)m//s`
    C
    `4xx10^(-3)m//s`
    D
    `7.5xx10^(-3)m//s`

  • A uniform wire of length L and weight W is rigidly fixed at one end and a load W_1 is applied at its othe end. IF the area of cross section of the wire is S, then stress developed In the wire at a distance (3L)/4 from its lower end will be (assume that increase in length of the wire is very small)

    A
    `W_1/S`
    B
    `(((3W)/4))/S`
    C
    `((W_1+(3W)/4))/S`
    D
    `((W_1+(W)/4))/S`

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    At what temperature the resistance of a copper wire will become three times its value at 0^@C ? Temperature coefficient of resistance for copper 4xx10^(-3)//C

    A Cu wire of cross sectional area 1mm^2 is carying current 0.21A. What is the drift velocity of the free ejectrons in the wire?. Electron density of Cu = 8.4xx10^28/m^3 .

    Find the elastic deformation energy of a steel rod of mass m=3.1 kg stretched by a tensile strain 1.0xx10^-3 . (Density of steel 7.8xx10^3 kg//m^3 )

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