Question:
The electric current produced when the charge carrier concentration moves from region of higher concentration to the region of lower concentration is called
The electric current produced when the charge carrier concentration moves from region of higher concentration to the region of lower concentration is called
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Drift current: \(\vec{J}_{drift} = q(n\mu_n + p\mu_p)\vec{E}\).
Diffusion current: \(\vec{J}_{diff} = qD_n \nabla n - qD_p \nabla p\) (for electrons and holes respectively, signs depend on gradient direction).
Updated On: May 22, 2025
- Drift current
- Diffusion current
- Reverse saturation current
- Breakdown current
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The Correct Option is B
Solution and Explanation
Current in semiconductors arises from two main mechanisms:
Drift current: Due to the motion of charge carriers under the influence of an electric field.
Diffusion current: Due to the motion of charge carriers from a region of high concentration to a region of low concentration, driven by the concentration gradient. The question describes current due to movement from higher to lower concentration, which is diffusion current. Reverse saturation current is a small current in a reverse-biased diode. Breakdown current is a large current during diode breakdown. \[ \boxed{\text{Diffusion current}} \]
Drift current: Due to the motion of charge carriers under the influence of an electric field.
Diffusion current: Due to the motion of charge carriers from a region of high concentration to a region of low concentration, driven by the concentration gradient. The question describes current due to movement from higher to lower concentration, which is diffusion current. Reverse saturation current is a small current in a reverse-biased diode. Breakdown current is a large current during diode breakdown. \[ \boxed{\text{Diffusion current}} \]
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