Physics
Negative feedback in amplifiers

Increases bandwidth and increases noise
Increases bandwidth and decreases noise
Decreases bandwidth and increases noise
Decreases bandwidth and decreases noise

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Physics
In the process of magnetisation of a bar

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

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