Cross field revolving theory is the theory which discuss the cause of single phase induction motor not to be self starting. According to it, two different forces of same magnetude acts on the rotor in just opposite direction.Which makes the rotor standstill.
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Magnetic field lines don't cross.
Is what they are expecting you to know at the end of the course
He continued his search for a unified field theory -- a theory showing that gravity and electromagnetism are simply manifestations of the same underlying principle.
It is the theory of establishing three dimonsional positions of an area/field/ with respect to a known direction and known level. It is a very good application of trignometry.
The study of math is mathematics. Subdivisions in that broad category include (butare not limited to):algebrageometrytrigonometrycalculusdifferential equations (differentiation and integration, Transforms)statisticsabstract algebra (includes group theory, ring theory, field theory, and module theory)topologynumber theorylogicprobabilitystatisticsgame theoryfunctional analysisdynamical systems (includes "chaos theory")numerical analysisset theory