Discussion
Why does impedance reflect upwards by beta looking into the base?
Answer: A
For a given voltage across the emitter resistor, the base supplies only a beta-th of the current, so the apparent resistance at the base is beta times larger. The junction resistance is small, the collector current does not flow in the base, and bypassing would remove the effect entirely. Whenever a terminal handles a fraction of the current at the same voltage, the impedance seen there is scaled by the reciprocal of that fraction - a rule that covers transformers and followers alike.
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