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Q.

A Zener diode, having breakdown voltage equal to 10 V, is used in voltage regulator circuit shown in figure.  The current through the diode is

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a

20A

b

15mA

c

10mA

d

25mA

answer is D.

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Detailed Solution

Voltage across zener diode and load resistance remains same.Current through load resistance : IL=V0RL=102×103=5mAVoltage across series resistance : VS = V−VZ=25−10 = 15 VCurrent through series resistance : Is=VsRS=15500=0.03A=30mASo,  Current through diode : IZ=IS−IL=30−5=25mA
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A Zener diode, having breakdown voltage equal to 10 V, is used in voltage regulator circuit shown in figure.  The current through the diode is