AC Fundamentals, Circuit and Circuit Theory
The inductance of a coil can be increased by

Decreasing the number of turns
Increasing core length
Choosing core material having high relative permeability
Decreasing the diameter of the former

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AC Fundamentals, Circuit and Circuit Theory
In a R-L-C circuit

Exchange of power takes place between inductor and supply line
Exchange of power takes place between capacitor and supply line
Power is consumed in resistance and is equal to IR
All of the listed here

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