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