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ls the motion of a charge across junctio...

ls the motion of a charge across junction momentum conserving ? Why or why not ?

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When electron moves normal to uniform electric field E, it has definite drift velocity. Drift velocity is given by,
`v_(d) = (Ee tau)/(m) `
Also due to charge accumulate momentarily at junction it produce additional electric field which affect drift velocity. Hence, once charge leaves junction momentum is not conserved.
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