Discussion
What happens at reverse breakdown in an ordinary rectifier diode?
Answer: B
At breakdown the reverse current rises very steeply, and unless it is limited the diode is destroyed by the power dissipated. It does not begin conducting forwards, and the forward drop and junction capacitance are unaffected. The same mechanism is used deliberately in a Zener diode, where the current is limited externally, which illustrates that a failure mode and a design feature can be the same physics viewed differently. Reading the definition literally, rather than recalling a formula, is the reliable route through questions of this shape.
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