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Choose all possible options. Unidirectional core excitation referes to ___________
Only 1st quadrant in B-H curve of x'mer over one cycle operation
3rd & 4th quadrant in B-H curve of x'mer over one cycle operation
1st and 3rd quadrants in B-H curve of x'mer over one cycle operation
Only 4th quadrant in B-H curve of x'mer over one cycle operation