A long wire runs along the x-axis, carrying current in the +x direction. A proto

Question

A long wire runs along the x-axis, carrying current in the +x direction. A proton is moving away from the origin along the y-axis, in the +y direction. In which direction is the magnetic force acting on the proton?

The force points in the +x direction.

The force points in the -x direction.

The force points in the +z direction.

The force points in the -z direction.

QUESTION 2

Three long parallel wires, A, B, and C lie in a plane, with wire A 1cm to the left of wire B, and wire C 1cm to the right of wire B. If wire B experiences zero net force, which of the following situations is not possible?

All three wires carry the same magnitude of current in the same direction.

Wires A and C carry equal magnitudes of current in opposite directions and B carries no current.

All three wires carry the same magnitude of current, with A and B in the same direction but C in the opposite direction.

All three wires carry the same magnitude of current, with A and C in the same direction, but B in the opposite direction.

The force points in the +x direction.

The force points in the -x direction.

The force points in the +z direction.

The force points in the -z direction.

Explanation / Answer

1) a. The force points in the +x direction.

we can determine the resultant vector direction by using right hand rule.

Take your right hand fingers in the direction of B and curl towards v, then your thumb indicates the direction of resultant vector.

2) c. All three wires carry the same magnitude of current, with A and B in the same direction but C in the opposite direction.

Because, parallel current wires attract each other and anti-parallel wires repel each other.

In this case netforce on B will be towards wire A.

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