Discussion
What breaks the thermal runaway loop in an emitter-biased stage?
Answer: B
As collector current rises, the emitter resistor's drop rises and eats into the base-emitter forward bias, reducing the current - negative feedback acting against the thermal positive feedback. The collector resistor limits the extreme but does not regulate, leakage does not saturate, and the divider's resistance barely moves. A positive feedback loop is beaten by putting a stronger negative one around it, which is the general remedy. Checking the units of each quantity catches a wrong formula before the arithmetic begins.
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