Question

Define specific resistance and state its unit in CGS and SI system.

Answer 1

Step 1: Specific resistance:

1. A conductor's resistivity or specific resistance ($\rho$) is defined as the resistance of a wire in a unit length and unit cross-sectional area.
2. $\rho =\frac{RA}{L}$

Where $R-$Resistance

$A-$The cross-sectional area of the wire

$L-$Length of the wire

Step 2: Unit of specific resistance in CGS and SI system:

1. The unit of resistance in a CGS system is $ohm-centimeter$ $\left(\Omega cm\right)$.
2. SI unit of specific resistance is $ohm-meter$ $\left(\Omega m\right)$.