A 20 V peak sinusoidal voltage is applied to the circuit in Figure 1 in place of the dc so...

A 20 V peak sinusoidal voltage is applied to the circuit in Figure 1 in place of the dc source. Draw the output waveform. Use the parameter values established in Problem.

Figure 1

Problem

To what value must R be adjusted in Figure 2 to make IZ = 40 mA? Assume VZ = 12 V at 30 mA and Zz = 30 Ω.

Figure 2