Physics
In the process of magnetisation of a bar

Only some parts of the outer layers of the bar get magnetised
Only the ends of the bar get magnetised
The entire bulk of the bar gets magnetised
Only the surface of the bar gets magnetised

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Physics
Analog synthesis refers to a technology based on

Representing data in terms of measurable physical quantities.
Placing brief digital recordings of live sounds under the control of a synthesizer keyboard.
Representing physical quantities as numbers.
Interfacing synthesizer equipment.

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