Transistors (Q_{1}) and (Q_{2}) in the voltage regulator circuit in Figure P15.74 have parameters (beta=200, V_{E B}()

Question:

Transistors $Q_{1}$ and $Q_{2}$ in the voltage regulator circuit in Figure P15.74 have parameters $\beta=200, V_{E B}($ on $)=0.7 \mathrm{~V}$, and $V_{A}=100 \mathrm{~V}$. The zero-current Zener voltage is $V_{Z O}=6.3 \mathrm{~V}$ and the Zener resistance is $r_{z}=15 \Omega$. Assuming an ideal op-amp, calculate the line regulation.

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