Electrical Engineering (EE) Exam > Electrical Engineering (EE) Questions > When forward bias is applied to a junction di...
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When forward bias is applied to a junction diode, it
- a)reduces the majority - carrier current to zero
- b)reduces the minority - carrier current to zero
- c)increases the potential barrier
- d)decreases the potential barrier
Correct answer is option 'D'. Can you explain this answer?
Verified Answer
When forward bias is applied to a junction diode, ita)reduces the majo...
Width of depletion layer, 
Hence, when forward bias is applied to a p-n junction diode, width of the depletion layer is reduced i.e. potential barrier is decreased
Hence, when forward bias is applied to a p-n junction diode, width of the depletion layer is reduced i.e. potential barrier is decreased
Most Upvoted Answer
When forward bias is applied to a junction diode, ita)reduces the majo...
Forward Bias in a Junction Diode
When a junction diode is forward biased, it allows current to flow easily through the device. This occurs due to the manipulation of the potential barrier at the p-n junction.
What Happens in Forward Bias?
- In forward bias, the positive terminal of the power source is connected to the p-type material, while the negative terminal is connected to the n-type material.
- This connection reduces the potential barrier that exists at the junction, facilitating the movement of charge carriers.
Decrease in Potential Barrier
- The potential barrier is created by the built-in electric field, which prevents the flow of majority carriers across the junction.
- When forward bias is applied:
- The positive voltage repels holes in the p-type region toward the junction.
- The negative voltage pushes electrons in the n-type region toward the junction.
- This influx of majority carriers decreases the height of the potential barrier, allowing for easier recombination of electrons and holes.
Resulting Effects
- The reduction of the potential barrier results in a significant increase in current flow through the diode.
- As the barrier decreases, minority carrier currents also increase, but the dominant effect is the enhancement of majority carrier current.
Conclusion
In summary, applying forward bias to a junction diode effectively decreases the potential barrier, allowing for a substantial flow of current, which is why option 'D' is the correct answer. This fundamental behavior is crucial for the operation of diodes in various electronic applications.
When a junction diode is forward biased, it allows current to flow easily through the device. This occurs due to the manipulation of the potential barrier at the p-n junction.
What Happens in Forward Bias?
- In forward bias, the positive terminal of the power source is connected to the p-type material, while the negative terminal is connected to the n-type material.
- This connection reduces the potential barrier that exists at the junction, facilitating the movement of charge carriers.
Decrease in Potential Barrier
- The potential barrier is created by the built-in electric field, which prevents the flow of majority carriers across the junction.
- When forward bias is applied:
- The positive voltage repels holes in the p-type region toward the junction.
- The negative voltage pushes electrons in the n-type region toward the junction.
- This influx of majority carriers decreases the height of the potential barrier, allowing for easier recombination of electrons and holes.
Resulting Effects
- The reduction of the potential barrier results in a significant increase in current flow through the diode.
- As the barrier decreases, minority carrier currents also increase, but the dominant effect is the enhancement of majority carrier current.
Conclusion
In summary, applying forward bias to a junction diode effectively decreases the potential barrier, allowing for a substantial flow of current, which is why option 'D' is the correct answer. This fundamental behavior is crucial for the operation of diodes in various electronic applications.
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When forward bias is applied to a junction diode, ita)reduces the majority - carrier current to zerob)reduces the minority - carrier current to zeroc)increases the potential barrierd)decreases the potential barrierCorrect answer is option 'D'. Can you explain this answer?
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Solutions for When forward bias is applied to a junction diode, ita)reduces the majority - carrier current to zerob)reduces the minority - carrier current to zeroc)increases the potential barrierd)decreases the potential barrierCorrect answer is option 'D'. Can you explain this answer? in English & in Hindi are available as part of our courses for Electrical Engineering (EE).
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