Resistance of a decimolar solution between two electrodes $0.02 \ m$ apart and $0.0004 \ m^2$ in area was found to be $50 \ \Omega$. Specific conductance $(\kappa)$ is $:$
- A$0.1 \ S \ m^{-1}$
- B$1 \ S \ m^{-1}$
- C$10 \ S \ m^{-1}$
- D$4 \times 10^{-4} \ S \ m^{-1}$
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