An iron wire has a diameter 3.65 mm and resistivity 9.71x 10-8 Qm. What will be the length of this wire to make a resistance of 100. What will be the new resistance, if the radius is doubled? (a) Length of the wire (in m) = %3D (b) Resistance of the wire (in 2 =

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Resistivity

Resistivity is a characteristic property of the conductor’s material that measures the extent to which the material opposes the flow of current. It is denoted by the Greek letter “rho”. Electrical resistivity, also known as specific resistance, depends on the nature of the material of the conductor and is unaffected by its dimensions.