How does partially sliding the core into the coil affect inductance?

Question

I understand how the number of turns makes a difference, but I can’t find anywhere what happens(or why) if the core is not fully in. I also didn’t find any circuit diagrams that would at least explain it numerically

In: 4

Answer 1

Thanks everyone for the replies! I feel somewhat stupid for not thinking that when you remove the core, there’s still air left there