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(B) Conductivity $(\kappa)$ is the reciprocal of resistivity $(ho)$.$\kappa = \frac{1}{ho}$Since resistivity $ho = R 	imes \frac{A}{l}$,where $

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$\Omega^{-1} \ cm^{-1}$

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(B) Conductivity $(\kappa)$ is the reciprocal of resistivity $(ho)$.$\kappa = \frac{1}{ho}$Since resistivity $ho = R 	imes \frac{A}{l}$,where $R$ is resistance in $\Omega$,$A$ is area in $cm^2$,and $l$ is length in $cm$.$\kappa = \frac{1}{R} 	imes \frac{l}{A} = \Omega^{-1} 	imes \frac{cm}{cm^2} = \Omega^{-1} \ cm^{-1}$.Thus,the common unit of conductivity in the $C.G.S.$ system is $\Omega^{-1} \ cm^{-1}$ or $S \ cm^{-1}$.

What is the common unit of conductivity if the dimensions are expressed in centimeter?

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