Which of the following factors influence the inductance of a coil?

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Proportional to the magnetic core's cross-sectional areaProportional to the square of the coil's number of turnsProportional to the core material's permeabilityInversely proportional to the length of the magnetic pathAll of the above factors affect inductance

Explanation

The inductance of a coil depends on multiple factors: it increases with the cross-sectional area of the magnetic core, the square of the number of turns in the coil, and the permeability of the core material, while it decreases as the length of the magnetic path increases. Therefore, all the factors listed (A through D) collectively influence the coil's inductance.