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back emf logo #21003(from the article `inductance`) ...the increase of a current than the same coil with an air core. The iron core increases the inductance; for the same rate of change of the current ...
Found on http://www.britannica.com/eb/a-z/b/3

Back emf

Back emf logo #21130voltage generated when a permanent magnet motor is rotated; a limiting factor for the high speed torque output of a permanent magnet motor as it is opposite in polarity to the supplied voltage and directly proportional to motor speed.
Found on http://www.empiremagnetics.com/glossary/glossary.htm#A
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