The zener diode has a $V _{ z }=30\, V$. The current passing through the diode for the following circuit is $\ldots \ldots \ldots \,mA.$

Why is there a sudden increase in current in Zener diode ?

Given below are two statements:

Statement $I$ : Photovoltaic devices can convert optical radiation into electricity.

Statement $II$ : Zener diode is designed to operate under reverse bias in breakdown region.

In the light of the above statements, choose the most appropriate answer from the options given below

A zener diode having breakdown voltage equal to $5\,V$ is used in voltage regulator circuit shown in figure, the current through diode is……..$mA$

What is value of current $I$ in given circuit……….$mA$