A Zener diode:

is a battery.

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has a constant voltage in the breakdown region.

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has a barrier potential of 1 V.

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is forward biased.

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Solution

The correct option is B has a constant voltage in the breakdown region.
A Zener diode is a form of a semiconductor diode in which at a critical reverse voltage (also known as Zener voltage) a large reverse current can flow. This Zener voltage is a constant value of voltage, which is in the breakdown region.

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