Design the amplifier in Figure P9.29 such that the output voltage varies between \(\pm 10 \mathrm{~V}\) as the wiper arm of the potentiometer changes from \(-10 \mathrm{~V}\) to \(+10 \mathrm{~V}\). What is the purpose of including \(R_{3}\) and \(R_{4}\) instead of connecting \(R_{1}\) directly to the wiper arm?

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50 Potentiometer +10 V Figure P9.29 -10 V R www R = 10 k2 www R = 1 kQ www R = 100 2 +