Virtual Labs

What happens to the electric field inside the depletion region of a PN junction at equilibrium?

a: It is zero everywhere Explanation

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b: It points from n-side to p-side Explanation

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c: It points from p-side to n-side Explanation

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d: It oscillates Explanation

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Which type of biasing reduces the width of the depletion region in a PN junction?

a: Forward bias Explanation

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b: Reverse bias Explanation

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c: No bias Explanation

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d: Thermal bias Explanation

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In a PN junction at equilibrium, what balances the diffusion current of electrons?

a: Recombination current Explanation

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b: Electron drift current Explanation

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c: Hole drift current Explanation

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d: Generation current Explanation

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What is the dominant mechanism of current flow in a PN junction under forward bias?

a: Drift of minority carriers Explanation

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b: Diffusion of majority carriers Explanation

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c: Recombination at contacts Explanation

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d: Photon-assisted tunneling Explanation

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How does the width of the depletion region vary with reverse bias voltage (V_R)?

a: Linearly with V_R Explanation

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b: Proportional to V_R² Explanation

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c: Proportional to √V_R Explanation

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d: Inversely proportional to V_R Explanation

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Under large forward bias, the I-V characteristic of a PN junction becomes:

a: Linear Explanation

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b: Exponential Explanation

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c: Parabolic Explanation

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d: Constant Explanation

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A PN junction is used in rectification circuits primarily because:

a: It passes current equally in both directions Explanation

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b: It stores charge efficiently Explanation

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c: It allows current only in one direction Explanation

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d: It behaves like an ideal resistor Explanation

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What effect does temperature increase have on the reverse saturation current I₀ of a PN junction?

a: It decreases Explanation

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b: It remains the same Explanation

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c: It increases exponentially Explanation

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d: It fluctuates randomly Explanation

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A Zener diode differs from a standard PN junction diode primarily because:

a: It operates in forward bias only Explanation

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b: It has no depletion region Explanation

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c: It allows significant current in reverse bias Explanation

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d: It blocks current in all conditions Explanation

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PN Junction Diode