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A diode allows current to flow:

AIn both directions
BOnly in forward bias (one direction)
CRandom
DNever
Answer & Solution
Correct answer: B. Only in forward bias (one direction)
p-n junction diode: forward biased (p positive, n negative) → conducts. Reverse biased (p negative, n positive) → blocks (very small leakage current). Acts as one-way valve.
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