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← ScienceWhich electric motor consequence occurs when operating past temperature limits?
A)Magnetic field strength decreases rapidly✓
B)Increased armature winding superconductivity occurs
C)Improved efficiency diminishes the back-EMF
D)Commutator spark erosion forms thicker deposits
💡 Explanation
Elevated winding temperature causes reduced performance because the Curie temperature is approached, initiating thermal demagnetization; therefore, field strength drops noticeably, rather than increasing conductivity or erosion below the threshold.
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