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Question

A Zener diode, having breakdown voltage equal to 15V is used in a voltage regulator circuit shown in figure. The current through the diode is
617258_f8824207229241008f85d1b6fbb16b8a.png

A
10mA
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B
15mA
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C
20mA
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D
5mA
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Solution

The correct option is D 5mA
For R=1kΩ
i1=151mA=15mA
R=250Ω
i250=2015250=5250=20mA
iZener=2015=5mA
651995_617258_ans_776cafbba4c44dc9a4505bc97d7a06d0.png

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