If used independently of other circuit components, as in security applications, the effective length-to-diameter ratio (related to the permeance coefficient) must be great enough to cause the magnet to work above the knee in its second quadrant demagnetization curve.
Ọ bụrụ na ejiri ya n'onweghị ihe ndị ọzọ dị na sekit, dịka ọ dị na ngwa nchekwa, ịdị ogologo ga-aba nha dayameta (nke metụtara ya na permeance coefficient) ga-adị ukwuu iji mee ka magnet na-arụ ọrụ n'elu ikpere ya na akụkụ abụọ nke Quagrant demagnetization.