What happen if you interchange the current and voltage probes of four probe?

If you interchange the current and voltage probes in a four-probe measurement setup, you will likely obtain incorrect readings. The current probe is designed to measure the current flowing through the sample, while the voltage probes measure the voltage drop across the sample. Reversing them can lead to inaccurate voltage measurements and potentially damage the equipment or the sample due to improper current flow. This error can also affect the calculated electrical properties, such as resistivity.