A Pole face area in square centimeters B Magnetic induction (flux density in the airgap.) B1 Reduced induction with increased airgap B2 Increased induction with reduced airgap Bm Critical induction, causing maximum unbalanced pull d H Differential quotient of induction and magnetomotive force in lines per sq. cm. and Gilbert's (4r/10 ampereturns) respectively
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