In a conductivity cell,the electrodes are separated by a distance of $2 \ cm$ and have a cross-sectional area of $4 \ cm^2$. If the conductivity of pure water is $8 \times 10^{-7} \ S \ cm^{-1}$,then the resistance of the water is:

  • A
    $8.13 \times 10^{-7} \ \Omega$
  • B
    $6.78 \times 10^{-5} \ \Omega$
  • C
    $6.25 \times 10^{5} \ \Omega$
  • D
    $7.18 \times 10^{7} \ \Omega$

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