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Define the term electrical resistivity of a material.
Resistivity is defined as the resistance offered by a conductor having unit length and unit cross-sectional area, and it depends on the nature of the substance and temperature. It is denoted by $\rho$ (rho).
Mathematically it is given as-
$\rho=\frac {R\times A}{l}$
where,
$\rho=Resistivity$
$R=Resistance$
$A=Cross-sectional\ Area$
$l=Length$
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