Define resistivity of a substance. give its unit how does it vary with time
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The electrical resistivity of a material is also known as its specific electrical resistance. It is a measure of how strongly a material opposes the flow of electric current. A definition of resistivity is the electrical resistance per unit length and per unit of cross-sectional area.
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resistance is obstruction offered to flow of electric current
its Si unit is Ohm
its Si unit is Ohm
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