If the distance between two $Pt$ electrodes is $2 \, cm$,the cross-sectional area is $4.0 \, cm^2$,and the resistance is $25 \, \Omega$,find the molar conductivity of a $0.5 \, M$ solution.
- A$40 \, S \, cm^2 \, mol^{-1}$
- B$20 \, S \, cm^2 \, mol^{-1}$
- C$80 \, S \, cm^2 \, mol^{-1}$
- D$10 \, S \, cm^2 \, mol^{-1}$
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