A piece of wire of cross-sectional area 2 mm2 has a resistance of 300. Find (a) the resistance of a wire of the same length and material if the cross-sectional area is 5 mm2, (b) the cross-sectional area of a wire of the same length and material of resistance of 750 ohm

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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.