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A steel wire of lenght 0.20 m and unifor...

A steel wire of lenght 0.20 m and uniform cross section `10^(-4) m^2` is tied rigidly at both ends.The temperature of the wire is change from `40^@` to `20^@C` . Calculate the thermal tension in the wire given `alpha= 1.1 xx 10^(3)//""^@C.` and Y `= 2 xx 10^(11)Nm^(2)`

Answer

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Knowledge Check

  • The specific resistance of a wire of length 1m, area of cross-section 0.5 m^(2) , is 25 micro-ohm cm. The resistance of the wire is

    A
    `2 xx 10^(-6)` ohms
    B
    `3 xx 10^(-6)` ohms
    C
    `6 xx 10^(-5)` ohms
    D
    `5 xx 10^(-5)` ohms

  • A current of 2 A is passing through a metal wire of cross sectional area 2 xx 10^(-6) m^(-2) . If the number density of free electrons in the wire is 5 xx 10^(26) m^(-3) , the drift speed of electrons is (given e = 1.6 xx 10^(-19) C)

    A
    `(1)/(16) ms^-1`
    B
    `(1)/(40) ms^(-1)`
    C
    `(1)/(80) m s^(-1)`
    D
    `(1)/(32) ms^(-1)`

  • A current of 2 A is passing through a metal wire of cross-sectional area 2 xx 10^(-6) m^(2) . If the number density of free electrons in the wire is 5 xx 10^(26) m^(-3) , the drift speed of electrons is : (Given, e = 1.6 xx 10^(-19) C)

    A
    `1/32ms^(-1)`
    B
    `1/16ms^(-1)`
    C
    `1/40ms^(-1)`
    D
    `1/80ms^(-1)`

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