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How does the resistance of a conductor vary with the increase of temperature ?

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Knowledge Check

  • The resistance of a conductor is

    A
    Directly proportional to area of cross-section
    B
    Directly proportional to length of conductor
    C
    Inversely proportional to length of conductor
    D
    Inversely proportional to temperature of conductor

  • Incandescent bulbs are designed by keeping in mind that the resistance of their filament increases with the increase in temperature. If at room temperature, 100 W, 60 W and 40 W bulbs have filament resistance R_(100), R_(60) and R_(40) , respectively, the relation between these resistances is :

    A
    `1/(R_(100))=1/(R_(40))+1/(R_(60))`
    B
    `R_(100)=R_(40)+R_(60)`
    C
    `R_(100)gtR_(60)gtR_(40)`
    D
    `1/(R_(100))gt1/(R_(60))gt1/(R_(40))`

  • Resistance of a conductor depends on its

    A
    Length
    B
    Density
    C
    Volume
    D
    Mass

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