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(B) The resistance $R$ of a conductor is given by the formula $R = \rho \frac{L}{A}$,where $\rho$ is the resistivity,$L$ is the length,and $A$ is the

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$\Omega \cdot m$

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(B) The resistance $R$ of a conductor is given by the formula $R = ho \frac{L}{A}$,where $ho$ is the resistivity,$L$ is the length,and $A$ is the cross-sectional area.Rearranging the formula for resistivity,we get $ho = R \cdot \frac{A}{L}$.The $SI$ unit of resistance $R$ is Ohm $(\Omega)$,the unit of area $A$ is square meter $(m^2)$,and the unit of length $L$ is meter $(m)$.Substituting these units into the formula: $	ext{Unit of } ho = \Omega \cdot \frac{m^2}{m} = \Omega \cdot m$.Therefore,the $SI$ unit of resistivity is $\Omega \cdot m$.

The $SI$ unit of resistivity of the material is $......$

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