Practice portal › Electromagnetic Induction › Self-Inductance
Asked in GUJCET 2021 · Coil geometry, cores and combinations
Idea: for a long solenoid, L = (μ₀N²A)/l.
With N fixed, L ∝ A/l: it grows with the area and falls with the length.
The only option in which both changes raise L is: A increases and l decreases.
So L increases when l decreases and A increases.
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