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

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Electromagnetic induction
A laminated iron core has reduced eddy-current losses because

The magnetic flux is concentrated in the air gap of the core
The laminations are stacked vertically
More wire can be used with less D.C. resistance in coil
The laminations are insulated from each other

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