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The Zener diode in the circuit shown in figure 5 has a working range of current for proper regulation: 5mA ≤ I_z ≤50mA and a Zener voltage V_z= 55V, if the input voltage, , varies from 150 and 250 V and = 3:3 kΩ, determine the range of values for the resistor, R, to maintain regulation.

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The Zener diode in the circuit shown in figure 5 has a working range of current for proper regulation: 5mA ≤ Iz ≤50mA and a Zener voltage Vz= 55V, if the input voltage, , varies from 150 and 250 V and = 3:3 kΩ, determine the range of values for the resistor, R, to maintain regulation.