Question

The main difference between the drift and diffusion
mechanisms of current flow in a transistor is that:
(1) The drift current flows due to forward bias while
diffusion current is due to reverse bias
(2) The drift current flows due to reverse bias while
diffusion current is due to forward bias
(3) The drift current depends on concentration gradient
while diffusion current depends on electric field
(4) The drift current depends on electric field while
diffusion current depends on concentration gradient

Answer 1

4 is the ans

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