Is the motion of a charge across junction momentum conserving? Why or why not?
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In the circuit when an electron approaches a junction, in addition to the uniform $E$ that faces it normally $($which keep the drift velocity fixed$)$, as drift velocity $(v_d)$ is directly proportional to Electric field $(E)$. That’s why there are accumulation of charges on the surface of wires at the junction.
These produce additional electric fields. These fields alter the direction of momentum. Thus, the motion of a charge across junction is not momentum conserving.
These produce additional electric fields. These fields alter the direction of momentum. Thus, the motion of a charge across junction is not momentum conserving.
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