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

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

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AC Fundamentals, Circuit and Circuit Theory
A phasor is

A line representing the magnitude and direction of an alternating quantity
A line which represents the magnitude and phase of an alternating quantity
An instrument used for measuring phases of an unbalanced 3-phase load
A colored tag or band for distinction between different phases of a 3-phase supply

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