Discussion
In Wenner configuration the electrodes are :
Answer: A
In the Wenner configuration the electrodes are equally spaced.
The four electrodes are placed in a line in the order current-potential-potential-current, with the same spacing a between each adjacent pair. The apparent resistivity is then:
\[ \rho_{a} = 2\pi a \frac{\Delta V}{I} \]
Option C describes the Schlumberger array, in which the current electrodes are spread far apart while the potential electrodes stay close together; option D describes no standard array. Since the Wenner spacing is uniform, 'unequally spaced' is also wrong.
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