tan δ m μ r = μ ″ ( μ ′ ) 2 MathType@MTEF@5@5@+=feaagCart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbbjxAHXgaruavP1wzZbItLDhis9wBH5garmWu51MyVXgarqqtubsr4rNCHbGeaGqipG0dh9qqWrVepG0dbbL8F4rqqrVepeea0xe9LqFf0xc9q8qqaqFn0lXdHiVcFbIOFHK8Feea0dXdar=Jb9hs0dXdHuk9fr=xfr=xfrpeWZqaaeaaciWacmGadaGadeaabaGaaqaaaOqaamaalaaabaGaciiDaiaacggacaGGUbGaaGPaVlaaykW7cqaH0oazdaWgaaWcbaGaaiyBaaqabaaakeaacqaH8oqBdaWgaaWcbaGaciOCaaqabaaaaOGaeyypa0ZaaSaaaeaacuaH8oqBgaGbaaqaamaabmaabaGafqiVd0MbauaaaiaawIcacaGLPaaadaahaaWcbeqaaiaaikdaaaaaaaaa@4802@
where µ′ and µ″ are the real and imaginary components respectively of the complex permeability
où µ′ et µ″ sont respectivement la partie réelle et la partie imaginaire de la perméabilité complexe