Physics
Negative feedback in amplifiers

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

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Physics
On a cold day when the room temperature is 15°C, the metallic cap of a pen becomes much colder than its plastic body, though both are at the same temperature of 15°C, because :

Plastics have a lower density than metals
Plastics have a higher thermal conductivity than metals
Metals have higher thermal capacity than plastics
Metals are good conductors of heat

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