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<br />12 <br /> <br />Review I Electric Fields in Water <br /> <br />Impacts of Electrofishing on Fish <br /> <br /> <br />Isolated Spherical Electrode <br />NOTE: Total current bet'Neen any t'NO Currerlllines is the same, zone illustrations assume both polarities <br />Ire equally effective (ie, ac excitation), voltage levels ror illusntion only <br /> <br />_ Electrode _ Danger Zone I.:~;' Effective Zone <br /> <br />Figure 7. Hypothetical two-dimensional maps of heterogeneous electric fields around and between <br />electrodes (reproduced from Novotny 1990, Figure 3.10). When electrodes are sufficiently far apart, <br />the field about each is essentially isolated as indicated in the lower diagram. Isopotential (constant- <br />voltage) lines are perpendicular to the radiating lines of current. <br /> <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />II <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />