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If the length of a wire is doubled and its cross – section area decreased to half ,the resistivity of the wire becomes the same ( put true or false) pleas drwls

  • Physica -

    Resistivity ( ρ )doesn’t depend on the length and area; it depends on the properties of the substance and temperature. Resistance depends on ρ, L, and A as
    R1= ρ •L/A
    R2=ρ•2L/(A/2)=4 •ρ•L/A=4•R1

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