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

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

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Electromagnetic induction
The inductance of a coil will increase under all the following conditions except

When more area for each turn is provided
When the number of turns of the coil increase
When permeability of the core increases
When more length for the same number of turns is provided

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