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प्रश्न
The drift current in a p-n junction is
पर्याय
from the n-side to the p-side
from the p-side to the n-side
from the p-side to the side if the junction is forward-biased and the opposite direction if it is reverse-biased
from the p-side to the n-side if the junction is forward-baised and in the opposite direction if it is reverse-biased.
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उत्तर
from the n-side to the p-side
After the diffusion of majority charge carriers across a p‒n junction, an electric field is set up because of the accumulation of immobile ions at the junction. These further oppose the motion of majority charge carriers across the junction. As a result, electrons from the p region start moving to the n region and holes from the n region start moving to the p region. This constitutes the drift current. As the direction of the current is opposite to the direction of the motion of the electrons, the direction of the drift current is from the n side to the p side.
In forward biasing, there is no movement of electrons from the p region to the n region and of holes from the n region to the p region. Hence, there is not drift current.
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संबंधित प्रश्न
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(d) there is a constant electric field near the junction.
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(Assume that the resistance of each diode is zero in forward bias and is infinity in reverse bias.)
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A load resistor of 2kΩ is connected in the collector branch of an amplifier circuit using a transistor in common-emitter mode. The current gain β = 50. The input resistance of the transistor is 0.50 kΩ. If the input current is changed by 50µA. (a) by what amount does the output voltage change, (b) by what amount does the input voltage change and (c) what is the power gain?
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p-n junction diode is formed
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