Electromagnetic induction
The coefficient of coupling between two air core coils depends on

Self-inductance of two coils only
None of the listed here
Mutual inductance and self inductance of two coils
Mutual inductance between two coils only

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Electromagnetic induction
A laminated iron core has reduced eddy-current losses because

The laminations are insulated from each other
More wire can be used with less D.C. resistance in coil
The laminations are stacked vertically
The magnetic flux is concentrated in the air gap of the core

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