The self-inductance $L$ of a solenoid of length $l$ and area of cross-section $A$ increases . . . . . . (Here with a fixed number of turns $N$).
- A$l$ increases and $A$ decreases.
- B$l$ decreases and $A$ increases.
- C$l$ and $A$ increase.
- DBoth $l$ and $A$ decrease.
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