What is the value of output voltage $V_0$ in $V$ for the circuit shown in the figure?

$A$ certain $p-n$ junction,having a depletion region of width $20 \,\mu m$,was found to have a breakdown voltage of $100 \,V$. If the width of the depletion region is reduced to $1 \,\mu m$ during its production,then it can be used as a zener diode for voltage regulation of .......... $V$.

An experiment is performed to determine the $I-V$ characteristics of a Zener diode,which has a protective resistance of $R = 100 \,\Omega$ and a maximum power dissipation rating of $P = 1 \,W$. The minimum voltage range of the $DC$ source in the circuit is

$A$ Zener diode of power rating $1.6\,W$ is to be used as a voltage regulator. If the Zener diode has a breakdown voltage of $8\,V$ and it has to regulate an input voltage fluctuating between $3\,V$ and $10\,V$, the value of series resistance $R_s$ for the safe operation of the diode will be $.........\Omega$.

The following diagram shows a Zener diode as a voltage regulator. The Zener diode is rated at $V_Z = 5 \text{ V}$ and the desired current in the load is $5 \text{ mA}$. The unregulated voltage source can supply up to $25 \text{ V}$. Considering the Zener diode can withstand four times the load current, the value of resistor $R_S$ (shown in the circuit) should be . . . . . . $\Omega$. (in $\text{ } \Omega$)

An ideal Zener diode with a breakdown voltage of $3 \text{ V}$ is reverse-biased with an input voltage $V_i = 5 \text{ V}$. The magnitude of the voltage difference between points $B$ and $A$ is: (in $\text{ V}$)