Which of the following methods effectively increases the inductance of a coil?

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Extending the length of the coil's coreReducing the total number of coil turnsLowering the diameter of the coil's formUsing a core material with high relative permeabilityNone of the above

Explanation

Increasing the inductance of a coil is best achieved by selecting a core material with a high relative permeability, as this enhances the magnetic flux linkage. Extending the core length, reducing the number of turns, or decreasing the former's diameter generally reduces inductance rather than increasing it.