Discussion
A divider must be stiff against a base impedance of \( 150 \ \mathrm{k\Omega} \). Its Thevenin resistance should be no more than about
Answer: D
The usual criterion is a tenth of the reflected impedance:
\[ \begin{aligned} R_{th} &\le \frac{150 \ \mathrm{k}}{10} \\ &= 15 \ \mathrm{k\Omega} \end{aligned} \]
giving about 15 kilohms. Matching the two would leave the base voltage moving noticeably with beta, and a larger value would be worse still. A factor of ten is the conventional margin for treating one impedance as negligible beside another, and it recurs throughout circuit design.
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