For electrolytes, Ohm's Law may be written as :

\frac{V}{I} = R

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\frac{V + V_{b a c k}}{I} = R

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\frac{V - V_{b a c k}}{I} = R

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\frac{V_{b a c k - V}}{I} = R

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Solution

The correct option is D $\frac{V - V_{b a c k}}{I} = R$
For electrolytes, Ohm's Law is that the resistance offered by the electrolyte is the ratio of the potential difference applied to the electrolyte and the current passing through the electrolyte.
Therefore
resistance $= R = \frac{p o t e n t i a l d i f f e r e n c e}{c u r r e n t} = \frac{V - V_{b a c k}}{I}$

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For electrolytes, Ohm's Law may be written as :

The correct option is D V−VbackI=RFor electrolytes, Ohm's Law is that the resistance offered by the electrolyte is the ratio of the potential difference applied to the electrolyte and the current passing through the electrolyte.Thereforeresistance =R=potential differencecurrent=V−VbackI