Electromagnetic induction
If current in a conductor increases then according to Lenz's law self-induced voltage will

Tend to decrease the amount of current
Aid the increasing current
Produce current opposite to the increasing current
Aid the applied voltage

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

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

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