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# I need help with The figure shows a DC voltage regulator circuit, with a Zener diode of breakdown voltage=6V. If the unregulated input voltage varies between 10 V to 16 V, then what is the maximum Zener current?

The figure shows a DC voltage regulator circuit, with a Zener diode of breakdown voltage=6V. If the unregulated input voltage varies between 10 V to 16 V, then what is the maximum Zener current?

• Option 1)

2.5 mA

• Option 2)

1.5 mA

• Option 3)

7.5 mA

• Option 4)

3.5 mA

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Zener diode -

It can operate continuously without being damaged in the region of reverse  biased

- wherein

1) It acts as voltage regulator

2) In forward biasing it act as ordinary diode .

$i_{1}=\frac{6}{4}=1.5 mA$

When the battery voltage is 16 V, the maximum current will be obtained

$i=\frac{16-6}{2}=5mA$

$i_{max}=5-1.5=3.5mA$

Option 1)

2.5 mA

Option 2)

1.5 mA

Option 3)

7.5 mA

Option 4)

3.5 mA

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