Discussion
What does a thermistor in the bias divider do?
Answer: C
A negative-coefficient thermistor in the lower divider arm falls in resistance as things warm, pulling the base voltage down and reducing the current. It does not alter the emitter resistance, beta rises rather than falls with temperature, and it does not limit current directly. Using a component whose imperfection is the wanted behaviour is a neat inversion, and it is why thermistors appear in bias networks at all. Checking the units of each quantity catches a wrong formula before the arithmetic begins.
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