Physics
An integrated circuit is more advantages than a coventional circuit because

If a part of the integrated circuit fails the entire circuit is simply replaced
All listed here
A faulty part of a conventional circuit may be difficult to locate and repair
They make the electric equipments more reliable and easier for servicing

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Physics
In the process of magnetisation of a bar

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

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