The forward bias applied to a PN-junction diode is increased

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The forward bias applied to a PN-junction diode is increased from zero to higher values. Rapid increase in the current flow for a relatively, small increase in voltage occurs—

1. Immediately
2. Only after the forward bias exceeds the potential barrier
3. When the flow of minority carriers is cause an avalanche breakdown
4. When the depletion area becomes large than the space-charge area

Correct Option: B

NA