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The self-inductance of a solenoid depends on which of the following factors?

1. Its length
2. Its cross-sectional area
3. The permeability of the material
4. The product of permeability, square of the number of turns, cross-sectional area, divided by its length

Correct answer: The product of permeability, square of the number of turns, cross-sectional area, divided by its length

Solution

Self-inductance of a solenoid depends on its geometry and material properties. It is proportional to μ (permeability), N² (number of turns squared), A (cross-sectional area), and inversely proportional to l (length). Hence, the correct formula is μN²A/l.

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