Discussion
Why is the base-emitter drop taken as 0.7 volts in these calculations?
Answer: D
The drop moves only about sixty millivolts per decade of current, so a single figure is accurate enough for bias work across the whole useful range. It is certainly not exact, is unrelated to where beta peaks, and has nothing to do with runaway. An approximation is defensible when the quantity it replaces varies far less than the tolerances of everything else in the calculation, and this is a textbook case. The parameter that varies and the parameter that does not are worth naming before any substitution is attempted.
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