KVPY SX SB Exam 20141 Question Paper

Question : 36 of 120

Marks: +1, -0

A certain p-n junction, having a depletion region of width 20 µm, was found to have a breakdown voltage of 100 V. If the width of the depletion region is reduced to 1 µm during its production, then it can be used as a Zener diode for voltage regulation of

5 V
10 V
7.5 V
2000 V

Validate

Solution:

Break down voltage is proportional to width of depletion region.
∴ When width reduce to 1 µm thus become

1/20

times then break down voltage also become

1/20

times thus it
become 5 volt. So Zener diode can used for voltage regulation of 5 volt.

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