TheoProb_II - IPhO2002 II. Sensing Electrical Signals Some...

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3 II. Sensing Electrical Signals Some seawater animals have the ability to detect other creatures at some distance away due to electric currents produced by the creatures during the breathing processes or other processes involving muscular contraction. Some predators use this electrical signal to locate their preys, even when buried under the sands. The physical mechanism underlying the current generation at the prey and its detection by the predator can be modeled as described by Figure II-1. The current generated by the prey flows between two spheres with positive and negative potential in the prey’s body. The distance between the centers of the two spheres is l s , each having a radius of r s , which is much smaller than l s . The seawater resistivity is r . Assume that the resistivity of the prey’s body is the same as that of the surrounding seawater, implying that the boundary surrounding the prey in the figure can be ignored. Figure II-1. A model describing the detection of electric power coming
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This note was uploaded on 11/08/2011 for the course PHYS 0000 taught by Professor Na during the Spring '11 term at Rensselaer Polytechnic Institute.

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TheoProb_II - IPhO2002 II. Sensing Electrical Signals Some...

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