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A negligbly small current is passed thro...

A negligbly small current is passed through a wire of length 15 cm and uniform cross-section `6.0xx10^(-7) m^(2)` and its resistance is measured to be `5.0 Omega`. What is the resistivity of the material at the temperature of the experiment ?

A

`1.8xx10^(-6)Omega-m`

B

`0.2xx10^(-6)Omega-m`

C

`0.6xx10^(-6)Omega-m`

D

`0.9xx10^(-6)Omega-m`

Text Solution

Verified by Experts

The correct Answer is:
B
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A negligibly small current is passed through a wire of length 15 m and uniform cross-section 6.0 xx 10^(-7)m^2 , and its resistance is measured to be 5.0 Omega . What is the resistivity of the material at the temperature of the experiment ?

A negligibly small current is passed through a wire of length 15 m and uniform cross-section 6.0 xx 10^(-7)Omega m^(2) , and its resistance is measured to be 5.0 Omega . What is the resistivity of the material at the temperature of the experiment ?

Knowledge Check

  • A copper wire of length 2m and area of cross-section 1.7 xx 10^(-6)m^(2) has a resistance of 2 xx 10^(-2) ohms. Calculate the resistivity of copper.

    A
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    C
    `1.7 xx 10^(-10)`
    D
    `1.7 xx 10^(-11)`

  • A current i passes through a wire of length l , radius of cross-section r and resistivity rho . The rate of heat generation is

    A
    `(i^(2)l rho)/(pi r^(2))`
    B
    `i^(2)((l rho)/(pi r^(2)))^(2)`
    C
    `i^(2)l rho//r`
    D
    `i l rho//r`

  • A nichrome wire of length 100 cm and area of cross-section 0.5 m m^(2) has a resistance of 2.2 Omega . The resistivity of nichrome is

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    C
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    D
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