Discussion
In a transformer, the magnetic coupling between the Primary and Secondary Circuit can be increased by:
Answer: C
Coupling is increased by Using the magnetic core of low reluctance.
Coupling is the fraction of the primary's flux that also links the secondary. A core of low reluctance, a high-permeability closed iron path, carries most of the flux through both windings and so reduces leakage flux.
More turns raise the flux linkage of each winding but do not make the flux that links one winding link the other. The material of the windings has nothing to do with magnetic coupling, and the quality of the oil affects insulation and cooling only.
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