A negligibly small current is passed though a wire of length 15m & resistance of  5Ω,having uniform cross section  of 6×10−7m2, then coefficient of resistivity of material is

A negligibly small current is passed though a wire of length 15m & resistance of  5Ω,having uniform cross section  of 6×107m2, then coefficient of resistivity of material is

  1. A

    1×107Ωm

  2. B

    2×107Ωm

  3. C

    3×107Ωm

  4. D

    4×107Ωm

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    Solution:

    Length l=15m] Resistance  R=5Ω
    Cross sectional area  A=6×107 
      
    ρ=RAl=5×6×10715ρ=2×107Ωm

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