In a Zener diode,the reverse bias voltage is $3 \ V$ and the width of the depletion region is $300 \ \mathring{A}$. The electric field intensity will be $\dots \ V/cm$.

Write a short note on a Zener diode.

An $8\,V$ Zener diode along with a series resistance $R$ is connected across a $20\,V$ supply (as shown in the figure). If the maximum Zener current is $25\,mA$,then the minimum value of $R$ will be $\Omega$.

If the current in the Zener diode is five times the current in $R_1$ and the breakdown voltage of the diode is $6 \text{ V}$,find the value of $R$.

$A$ Zener diode acts as a/an

$A$ 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 .......... $V$.