Question

A charge is moving across a junction, then.
A.Momentum will be conserved
B.Momentum will not be conserved
C.At some places, momentum will be conserved and in some other places momentum will not be conserved
D.None of these

Answer 1

Hint: The flow of charges in wires makes our life so easy. Electric charges are a fundamental physical property. This physical property causes objects to feel attractive or repulsive forces. Electricity is produced by the movement or flow of charged particles. Now we need to say what will happen if a charge is moving across a junction and state which one of the given options is true. Let’s see which statement is true in the following paragraphs.

Complete answer:
When the charges are moving across a junction usually there will be an accumulation of charges on the surface of the wires at the junction. This makes the charges to the additional electric field. In the beginning, when the charges are moving there will be an electric field present in the charge and this electric field is what makes the drift velocity fixed. Now when it crosses the junction the charge will gain an additional electric field due to the surface charges. This results in the variation in the direction of the momentum of the charge. Therefore the initial momentum of the charge will not be equal to the final momentum of the charge and therefore the momentum will not be conserved.

Therefore the correct option is B.

Note:
The concept of how an electric field can influence charge within a circuit as it moves from one location to another location is one of the fundamental principles that allow us to understand electric circuits. The unit of static electricity first introduced the concept of the electric field. When the concept of electricity was first introduced it was named a non-contact force.