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The transistor are usually made of

1. metal oxides with high temperature coefficient of resistivity.
2. metals with high temperature coefficient of resistivity.
3. metals with low temperature coefficient of resistivity.
4. semiconducting materials having low temperature coefficient of resistivity.

Correct answer: semiconducting materials having low temperature coefficient of resistivity.

Solution

Transistors are built from semiconductors because their conductivity can be precisely controlled by doping and electric fields. A low temperature coefficient of resistivity is desirable so the device remains stable as temperature changes.

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