Determine the minimum value of R1 so that the power

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In Figure Q2(b) Vs is an unregulated voltage that varies between 16 V and 18V while the Zener diode voltage is VZ = 15 V. The load resistor RL can have avalue from 1000 ? to 8 (i.e., open circuit). Also you can take IZ (min) = 0 A.(i) Find the maximum value of R1 so that the load voltage VL would bestill kept constant at 15 V for all values of RL and Vs.(ii) Provide a symbolic expression for the maximum power dissipated bythe Zener diode.(iii) Determine the minimum value of R1 so that the power dissipated bythe Zener diode does never exceeds 1 W for all values of RL and Vs.

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