(Solved): For the zener regulator circuit given below, zener diode breakdown voltage is given as V2=10V, ...

For the zener regulator circuit given below, zener diode breakdown voltage is given as $V_2=10\mathrm{V}$, (you may assume $r_z$ zener resistance as $O\Omega$ ), The power supply voltage $V_{ps}$ varies between $15\mathrm{V}$ and $20\mathrm{V}$ and $Ri$ is given as $100\Omega$. a) Find the minimum value of $R_L$ such that the zener diode remains properly biased over the range of variation of $V_{ps}$ for (minimum zener current should not be less than one-fourth of the maximum current) (Hint: You should consider the no-load state for maximum Zener current) b) Find the minimum and maximum power dissipated in the entire circuit.