J=σE where σ is the conductivity of the material E is the electric field and J is the current density
σ=1/ρ where ρ is the resistivity of the material
2.54×106=1.72×10−81×EE=2.54×1.72×10−2V/m =4.37×10−2V/m
In the next figure has not been provided so I am unable to answer it
but if the electric field is constant you can apply the formula
E=−ΔrΔV and if the electric field is variable apply dE=drdV
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