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In house wiring, copper wire 2.05 mm in ...

In house wiring, copper wire `2.05 mm` in diameter is often used. Find the resistane of `35.0 m` long wire. Specific resistance of copper is `1.72xx10^-8Omega-m`.

Text Solution

Verified by Experts

The correct Answer is:
A
`R=rhol/A=((1.72xx10^-8)(35))/((pi//4)(2.05xx10^-3)^2)=0.18Omega`
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Knowledge Check

  • The external diameter of a 314 m long copper tube is 1.2 cm and the internal diameter is 1 cm. calculate its resistance if the specific resistance of copper is 2.2xx10^(-8) ohm-metre.

    A
    `2.0xx10^(-1)ohm`
    B
    `4.4xx10^(-2)ohm`
    C
    `3.14xx10^(-2)ohm`
    D
    `2.2xx10^(-2)ohm`

  • When the resistance of copper wire is 0.1 Omega and the radius is 1mm, then the length of the wire is (specific resistance of copper is 3.14 xx 10^(-8) ohm xx m )

    A
    10 cm
    B
    10 m
    C
    100 m
    D
    100 cm

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    You need produce a set of cylindrical copper wire 3.50 m long will have a resistance of 0.125Omega each. What will be the mass of each of these wires? Specific resistance of copper =1.72xx10^-8Omega-m ,density of copper =8.9xx10^3kg//m^3

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