Discussion
When the applied voltage across the PN junction is less than zero, then :
Answer: B
Under reverse bias drift current flow is favourable.
When the applied voltage is less than zero, the PN junction is reverse biased. The external field adds to the built-in field, so the potential barrier rises and the depletion region widens. The higher barrier stops majority carriers from diffusing across, so diffusion current is suppressed. The stronger field, however, sweeps minority carriers across the junction, and this drift of minority carriers is the small reverse saturation current.
The barrier becomes larger, not smaller, and it is diffusion current, not drift current, that is no longer favoured, so the other three options describe forward bias or invert the effect.
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