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The reverse voltage applied to a varactor diode

is less than avalanche breakdown voltage
is more than avalanche breakdown voltage
may be more or less than a avalanche breakdown voltage
is very high as compared to avalanche breakdown voltage

Correct Answer: is less than avalanche breakdown voltage

Explanation:

The action of varactor diode is due to the capacitance of depletion layer. The thickness of depletion layer depends on the reverse bias which should not cause breakdown.

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