The average soil resistivity in the Wenner Four-Pin Method is a function of?

In the Wenner Four-Pin Method for measuring soil resistivity, the average resistivity is derived from the voltage drop measured between the central pair of pins. The voltage drop reflects how much potential difference occurs as current flows through the soil between these pins, which is essentially the electrical resistance of the soil. By utilizing this voltage measurement along with the known current applied through the outer pins, you can calculate the resistance encountered by the current.

The relationship established between voltage, current, and resistance as per Ohm's Law is foundational in determining resistivity, which is calculated using the formula for resistivity where resistivity equals the resistance times the geometric factor of the pins' arrangement. Therefore, the voltage drop between the center pins directly influences the result used to assess soil resistivity, making it fundamental to the Wenner method.