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computer science electronic principles
1. The core of an electromagnet is said to be in saturation when:
(A): an increase in current through the coil causes no further increase in the mmf
(B): changing the polarity of the current in the coil changes the polarity of the magnetic field around the core
(C): frequent changes in the direction of current through the coil causes heating effects in the core material
(D): None of the above
(E): the core is permitted to move freely within the coil
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