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Physica

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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
a)the same
b)four time
c)half
d)one fourth
e)double

  • Physica -

    Wire resistance is proportional to
    (Length)/(Area).

    You figure it out. L becomes 2L.
    A becomes A/2

    2L/(A/2) = 4 L/A

  • Physica -

    Half

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