I have a theoretical question to ask. Consider an infinite plane of a uniform resistivity material (e.g., conductive foam). Take two points A and B a fixed distance apart in this plane: <^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^> < > < A B > < > How, using techniques of electrical engineering, can the resistance in ohms be calculated between points A and B? Obviously it can be measured easily in practice by simply placing one ohmmeter probe at A and the other at B. But how could it be calculated from theory? It would seem this problem should be easy, similar to EMF field calculations for potential difference, etc., however it's not obvious to me as to how this could be done. Any suggestions or experience? The importance of the theoretical analysis is obvious: It allows answers to questions about parametric dependence on length and width of a finite rectangular piece, extends to non-uniform resistivity, etc. ================================================================ Robert A. LaBudde, PhD, PAS, Dpl. ACAFS e-mail: ral@lcfltd.com Least Cost Formulations, Ltd. URL: http://lcfltd.com/ 824 Timberlake Drive Tel: 757-467-0954 Virginia Beach, VA 23464-3239 Fax: 757-467-2947 "Vere scire est per causas scire" ================================================================ -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist