![]() ![]() The actual unitįor m is erg per gauss or erg per oersted.Īs in the SI, volume susceptibility is dimensionless, but its value in EMU is smaller than in the SI. “emu” however, “emu” is not a unit, but is simply an indicator of electromagnetic units. The unit for magnetic moment m is often expressed as Turning to EMU, the disadvantages are more serious. (which they could use if they instead wrote μ 0 H), or they mistakenly refer to Because M and J have different units, confusion is averted.Ī disadvantage of the SI is that, in practice, many researchers have the urge to use tesla as the unit for H ![]() Μ 0 H + J, the Kennelly convention, where J is H is magnetic field strength, and M is the magnetization and B = Where B is magnetic flux density, μ 0 is the permeability of vacuum, A possible disadvantage in the SI is that two constitutive relations are recognized:ī = μ 0( H + M), the Sommerfeld convention, One of the advantages of the SI is that it unifies magnetic and electrical units, whereas CGS bifurcates into EMU andĮlectrostatic units ( ESU). II. ADVANTAGES AND DISADVANTAGES OF THE SI AND EMU ![]() Importantly, the expected revision of the SI, to take effect in 2019, will The case for the SI remains compelling for the reasons first articulated by Giovanni Giorgi at the beginning of the 20th century Numerical values from one to the other, has been a source of confusion and error for students and practitioners.Īlthough the use of the SI in magnetics has some inconveniences, they are minor compared to the ambiguities in the EMU system. The coexistence of the SI and EMU in magnetics, and the conversion of Thomson, James Clerk Maxwell, and others, through the British Association for the Advancement of Science, remains in common use. Where the centimeter-gram-second ( CGS) system of electromagnetic units ( EMU), as formulated by William ( CGPM), has been generally accepted by researchers in most scientific disciplines. The International System of Units ( SI), established in 1960 by the General Conference on Weights and Measures ![]()
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