Evaluating integral for magnetic field intensity using mathematica

*To*: mathgroup at smc.vnet.net*Subject*: [mg50594] Evaluating integral for magnetic field intensity using mathematica*From*: "Edgar Y. Lobachevskiy" <lobachev at hawaii.edu>*Date*: Sat, 11 Sep 2004 06:45:04 -0400 (EDT)*Organization*: University of Hawaii*Sender*: owner-wri-mathgroup at wolfram.com

Hi, all: Did anyone try to use Mathematica to calculate the magnetix flux intensity of a rectangular magnetic block at an arbitrary point xyz? I am using the formulat H = -1/4pi*Integral [n' . M' (r_vector-r'_vector) da'/(r_vector-r'_vector)^3] I have seen the result done using mathematica, but when I try to evaluate this integral on my computer the mathematica has been taking about 4 hours and still did not produce any results? Is there a trick to this problem? -- Edgar Lobachevskiy Physics Dept University of Hawaii PH: 808-956-2949 FAX: 808-956-7107