Electromagnetic induction
In an iron cored coil the iron core is removed so that the coil becomes an air cored coil. The inductance of the coil will

Decreases
Remains same
Increases
None of the listed here

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Electromagnetic induction
The inductance of a coil will increase under all the following conditions except

When more length for the same number of turns is provided
When more area for each turn is provided
When the number of turns of the coil increase
When permeability of the core increases

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