Virtual Labs

What is the region called where electrons and holes recombine in a PN junction?

a: Conduction band Explanation

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b: Recombination region Explanation

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c: Depletion region Explanation

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d: Intrinsic region Explanation

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At equilibrium, what is the net current across a PN junction?

a: Purely hole current Explanation

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b: Purely electron current Explanation

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c: Zero Explanation

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d: Infinite Explanation

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What causes the built-in potential in a PN junction?

a: Ion implantation Explanation

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b: Temperature gradient Explanation

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c: Carrier diffusion Explanation

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d: External battery Explanation

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What happens to the depletion width if a PN junction is reverse biased?

a: It narrows Explanation

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b: It stays constant Explanation

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c: It disappears Explanation

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d: It widens Explanation

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Which of the following best explains current conduction under forward bias in a PN junction?

a: Majority carriers tunnel across the barrier. Explanation

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b: Depletion region increases, blocking carriers. Explanation

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c: Barrier lowers, allowing diffusion of carriers. Explanation

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d: Built-in potential increases, increasing resistance. Explanation

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In a reverse biased PN junction, which current dominates?

a: Diffusion current Explanation

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b: Majority carrier current Explanation

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c: Thermionic emission current Explanation

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d: Minority carrier current Explanation

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If both sides of a PN junction are heavily doped, what happens to the built-in potential?

a: It decreases Explanation

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b: It becomes negative Explanation

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c: It increases Explanation

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d: It vanishes Explanation

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In a PN junction, what is the mathematical relation between built-in potential and doping concentrations?

a: V_bi ∝ √(N_A + N_D) Explanation

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b: V_bi ∝ ln(N_AN_D) Explanation

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c: V_bi ∝ 1/(N_AN_D) Explanation

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d: V_bi ∝ N_A/N_D Explanation

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Why does reverse current in a diode saturate beyond a point?

a: All majority carriers contribute to current Explanation

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b: Depletion width becomes zero Explanation

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c: Minority carrier drift current is limited Explanation

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d: Thermal breakdown occurs Explanation

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PN Junction Diode