The correct symbol for a Zener diode is:

The figure shows a $DC$ voltage regulator circuit with a Zener diode of breakdown voltage $= 6\,V$. If the unregulated input voltage varies between $10\,V$ to $16\,V$, then what is the maximum Zener current in $mA$ (in $.5$)?

Find the current through the Zener diode in the given circuit. (in $mA$)

In the given circuit,what is the maximum value of $R_S$ (in $k\Omega$) for the Zener diode to regulate the voltage across the load resistance $R_L$?

$A$ potential divider circuit is connected to a $DC$ source of $20 \,V$, a light emitting diode $(LED)$ with a glow-in voltage of $1.8 \,V$, and a Zener diode with a breakdown voltage of $3.2 \,V$. The total length $(PR)$ of the resistive wire is $20 \,cm$. The minimum length of $PQ$ required for the $LED$ to just glow is ............. $cm$.

In a Zener diode,breakdown occurs in reverse bias due to