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Is the motion of a charge across junctio...

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

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When an electron approaches a junction, in addition to the uniform electric field E facing it normally. It keep the drift velocity fixed as drift velocity depnds on E by the relation drift velocity
`v_(d)=(eEtau)/(m)`
this result into accumulation of charges on the surface of wires at the function. these produce additional electric field. These fields change the direction of momentum. Thus, the motion of a charge across junction is not momentum conserving.
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Knowledge Check

  • A charge is moving across a junction, then

    A
    momentum will be conserved
    B
    momentum will not be conserved
    C
    at some places momentum be conserved and at other places momentum will not be conserved
    D
    none of these.

  • In Fig . V_(0) is the potential barrier across a p-n junction, when no battery is connected across the junction

    A
    1 and 3 both correspond to forward bias of junction
    B
    3 corresponds to forward bias of junction and 1 corresponds to reverse bias of junction
    C
    1 corresponds to forward bias and 3 corresponds to reverse bias of junction.
    D
    3 and 1 both correspond to reverse bias of junction.

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