Field Work : Electrical Method Basics Explained. During our recent resistivity and IP (Induced Polarization) survey, I demonstrated the Double Dipole Array technique , one of the most effective electrical methods in mineral exploration. In this method, multi electeodes system of electrodes are used: One pair injects current (C1–C2) into the ground. The other pair measures potential difference (P1–P2) between points on the surface. By switcher, the of moving these dipoles along the survey line, w