Question

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.

• A. $5$V
• B. $10$V
• C. $7.5$V
• D. $2000$V

Answer 1

The correct option is A $5$V

Break down voltage is proportional to width of depletion region

when the width is reduced by $1\mu m$, it becomes $\frac{1}{20}$ times then breakdown voltage also becomes $\frac{1}{20}$ times. thus is becomes $100/20=5V$