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Question
The core of an electromagnet is said to be in saturation when:
Options:
A .  changing the polarity of the current in the coil changes the polarity of the magnetic field around the core
B .  frequent changes in the direction of current through the coil causes heating effects in the core material
C .  an increase in current through the coil causes no further increase in the mmf
D .  None of these
E .  the core is permitted to move freely within the coil
Answer: Option C
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