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

Zener breakdown occurs in a $p-n$ junction having $p$ and $n$ both :

$A$ Zener diode, having a breakdown voltage of $15 \text{ V}$, is used in a voltage regulator circuit as shown. The current through the Zener diode is (in $\text{ mA}$)

Which of the following is heavily doped?

$A$ Zener diode having a Zener voltage of $8\, V$ and a power dissipation rating of $0.5\, W$ is connected across a potential divider circuit as shown in the diagram. The value of the protective resistance $R_p$ is $....\, \Omega$.

For the circuit shown below,the current through the Zener diode is......$mA$