NOTE The flux through a surface S of the vector V is denoted by ∬ S V⋅ e n dA MathType@MTEF@5@5@+= feaagKart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbbjxAHX garuavP1wzZbItLDhis9wBH5garmWu51MyVXgarqqtubsr4rNCHbGe aGqipG0dh9qqWrVepG0dbbL8F4rqqrVepeea0xe9LqFf0xc9q8qqaq Fn0lXdHiVcFbIOFHK8Feea0dXdar=Jb9hs0dXdHuk9fr=xfr=xfrpe WZqaaeaaciWacmGadaGadeaabaGaaqaaaOqaamaapifabaGaaCOvai abgwSixlaahwgadaWgaaWcbaGaamOBaaqabaGccaqGKbGaamyqaaWc baGaae4uaaqab0Gaey4kIiVaey4kIipaaaa@4129@ . If the surface is closed, the flux is denoted by ∯ S V⋅ e n dA MathType@MTEF@5@5@+= feaagKart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbbjxAHX garuavP1wzZbItLDhis9wBH5garmWu51MyVXgarqqtubsr4rNCHbGe aGqipG0dh9qqWrVepG0dbbL8F4rqqrVepeea0xe9LqFf0xc9q8qqaq Fn0lXdHiVcFbIOFHK8Feea0dXdar=Jb9hs0dXdHuk9fr=xfr=xfrpe WZqaaeaaciWacmGadaGadeaabaGaaqaaaOqaamaapyfabaGaaCOvai abgwSixlaahwgadaWgaaWcbaGaamOBaaqabaaabaGaae4uaaqab0Ga eSOeUlTaey4kIiVaey4kIipakiGacsgacaWGbbaaaa@4388@ .