Discussion
Which two temperature effects both tend to increase collector current?
Answer: B
Beta rises and the base-emitter drop falls, and both changes increase the collector current at a fixed bias - which, since more current means more heat, closes a positive feedback loop. Leakage rising is a third contributor in the same direction. That all the significant temperature effects push the same way is what makes bias stabilisation the central concern of the next topic rather than an afterthought.
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