Electronic Devices and Circuits
Which variety of copper has the best conductivity?

Hard drawn copper
Copper containing traces of silicon
Induction hardened copper
Pure annealed copper

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Electronic Devices and Circuits
An intrinsic silicon sample has 1 million free electrons at room temperature. As the temperature is increased

The number of free electrons increases but the number of holes decreases
The number of free electrons increases
The number of free electrons and holes increase but not by the same amount
The number of free electrons and holes increase by the same amount

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