A unit of magentic reluctance proposed by Vladimir Karapetoff in 1911, but not adopted.


The definition of the unit of reluctance follows directly from eq. (1). A magnetic circuit has a unit reluctance when a magnetomotive force of one ampere-turn produces in it a flux of one maxwell.² No name has been given to this unit so far. The author ventures to suggest the name rel, and he uses it provisionally in this book. Granting that reluctance is a useful quantity in magnetic calculations, one must admit that it should be measured in some units of its own; unless one chooses to use the cumbersome notation “ampere-turns per maxwell.” The name rel is simply the beginning of the word reluctance. Thus, a magnetic circuit has a reluctance of one rel when one ampere-turn produces one maxwell of flux in it. The unit rel is analogous to the ohm in the electric circuit, and to the daraf in the electrostatic circuit.

2 See Appendix I at the end of the book.

V. Karapetoff.
The Magnetic Circuit.
New York: McGraw-Hill Book Company, 1911.
Page 8.


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