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[" The resistivity of iron is "1times10^...

[" The resistivity of iron is "1times10^(-7)" ohm - "m" .The resistance "],[" of a iron wire of particular length and thickness is "1" ohm."],[" If the length and the diameter of wire both are doubled,"],[" then the resistivity in ohm- "m" will be "],[[" (a) "1times10^(-7)," (b) "2times10^(-7)],[" (c) "4times10^(-7)," (d) "8times10^(-7)]]

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