n where the minus sign is introduced to reflect the fact that the current flow at C2 (negative current electrode) is opposite in direction compared to the current flow for C1 (positive current electrode). The equations for the electric potential at P2 due to C1 and C2 are comparable in form to those of Equation (5.9) and Equation (5.10), and as a result, the total difference in electric potential, AV, between P1 and P2 can be expressed as follows:

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