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Mention any two factors on which the resistance of a cylindrical conductor depends. |
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Answer» Resistance R of a conductor depends upon length and area A of conductor. It has been experimentally confirmed that:R ∝ l, the lenth of the wireR ∝ {tex}\\frac1A{/tex}, where A is the area cross-section of the wireCombining above, we have: R ∝\xa0{tex}\\frac lA{/tex} or R = {tex}\\rho \\frac1A{/tex}where{tex}\\rho{/tex} is a constant called specific resistance or electric resistivity of the material of the conductor.If l = 1, A = 1, {tex}\\rho{/tex} = R.i.e. specific resistance (or electric resistivity) of a conductor is the resistance of a wire of unit length and a unit area cross-section. It may be defined as:Specific resistance of a conductor is the resistance of unit cube of the conductor.Unit of {tex}\\rho{/tex} :{tex}\\rho=\\;\\frac{RA}l=\\;\\frac{ohm\\;m^2}m=\\;ohm\\;m.{/tex} Thnks |
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