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A wire of length l and …

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A wire of length l and resistance is streched so that its length is double and area of cross section is halved .How will its resistance changr and resistivity chamge

    • Posted by Ankita Dewangan 7 years, 3 months ago

    CBSE > Class 12 > Physics
    • 1 answers

    Kapil Kumar 7 years, 3 months ago

    ¶= resistivity R= ¶ L/A L'= 2L A'=A/2 R'= ¶ L'/A' = ¶ 2L/(A/2) =¶. 4 L/A R'= 4 ( R) Resistance will become 4 times. resistivity changes when nature of material changes. ( if temperature is consider constant). Therefore there will be no change in resistivity

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