Q78 / 90 · KVPY 2014 (SB/SX) · Physics

A certain p-n junction, having a depletion region of width $20 \mu \mathrm{m}$, was found to have a breakdown voltage of 100 V.If the width of the depletion region is reduced to $1 \mu \mathrm{m}$ duringits production, then it can be used as azener diode for voltage regulation of :

  • Correct answer
    A
    $5 \mathrm{~V}$
  • B
    $10 \mathrm{~V}$
  • C
    $7.5 \mathrm{~V}$
  • D
    $2000 \mathrm{~V}$

Solution

$\begin{array}{l} \mathrm{V}=\mathrm{ed} \\ \mathrm{E}=\frac{100}{20 \mathrm{um}} \\ \mathrm{V}^{1}=\frac{100}{20} \times 1=5 \mathrm{v} \end{array}$

Hence, the correct answer is option: 'A'.

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