Inductance is the result of energy being stored in a magnetic field. You can't have a magnetic field without inductance.
Because they can then lift the steel easily without having to put chains and lifting gear onto it.
Mutual inductance describes the process by which a changing current in one coil, creates a changing magnetic flux which, when it links with a second coil, induces a changing voltage into that coil.
A spinning electromagnet does not produce power without other components that you need to specify.
Yes, an inductor works with direct current. It is called an electromagnet. Of course, a practical electromagnet has series resistance, otherwise the current in the inductor would increase to the limit of the current/voltage source.
Inductance is inductance, and is not a function of frequency. Frequency affects reactance, and ultimately impedance, not inductance.
yes it can
Type your answer here... By use an inductance meter or an inductance bridge
It is used to measure the inductance of a coil of unknown inductance.
In addition to the number if turns, the inductance also depends on the length and diameter of the winding, the pitch (number of turns per inch), and the material of the core if there is one. Search on line and find an empirical formula for the inductance of a finite coil, and then work to tweak the other parameters to alter the inductance as required.
Inductance is measured in henrys.
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A permanent magnet, like a refrigerator magnet, is an example of a non-electromagnet. It produces a magnetic field without the need for an electric current.