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

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

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AC Fundamentals, Circuit and Circuit Theory
The r.m.s. value of alternating current is given by steady (D.C.) current which when flowing through a given circuit for a given time produces

The same heat as produced by A.C. when flowing through the same circuit
The more heat than produced by A.C. when flowing through the same circuit
None of these
The less heat than produced by A.C. flowing through the same circuit

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