Is the motion of a charge across junction momentum conserving ? Why or why not ?
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When motion of charge is taking place across a junction, then momentum of charge is not conserved. Because when a charge (i.e., electron) approaches a junction, in addition to a uniform electric field `vec(E)` that it normally faces (which keeps the drift velocity `vec(v_(d))` fixed). there are accumulation of charges on the surface of wires at the junction. Which also produces electric field, resulting the variation in the direction of momentum of charge.
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