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Q.

A zener diode has  a constant potential  of 1V  in the absence of biasing.  It  undergoes  zener breakdown  for an electric field of  106Vm  at the depletion  region of P-N junction.   If  the width of the depletion region is  2.5μm What should be the reverse biased  potential  for the  zener  breakdown to occur

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a

0.5V

b

4V

c

2.5V

d

9V

answer is C.

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Detailed Solution

Reverse biased potential for the zener  breakdownVr= E×d=106×2.5×10−6=2.5V
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A zener diode has  a constant potential  of 1V  in the absence of biasing.  It  undergoes  zener breakdown  for an electric field of  106Vm  at the depletion  region of P-N junction.   If  the width of the depletion region is  2.5μm What should be the reverse biased  potential  for the  zener  breakdown to occur