In an unbaised \( p-n \) junction, holes diffuse from the \( p \)-region to \( n \) region becau...

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In an unbaised \( p-n \) junction, holes diffuse from the \( p \)-region to \( n \) region because :
(A) free electrons in the \( n \)-region attract them.
(B) hole concentration in \( p \)-region is more as compared to \( n \)-region.
(C) they move across the junction with same potential.
(D) All of the above
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