# Magnetic Field question

1. Mar 1, 2006

### jimmy_neutron

Here is my question:
Two wires lie perpendicular to the plane of the paper, and equal electric currents pass through the paper ( the one with the x means it is going through the plane, the one with the dot means it is coming out of the plane towards the viewer). Point P is equidistant from the two wires.
Construct a vector diagram showing the direction of the resultant magnetic field at point P.
Part II: If the currents in both wires were directed out of the plane show the field at point P.

Ok, so from a previous question I asked on here I know that the direction of the current can be found using the right hand rule. Using this rule the current should be moving in the counter clockwise direction in the wire that is coming out of the plane. And the current should be moving in the clockwise direction in the wire that is going through the plane. However, I do not know how to construct the vector diagram showing the resultant at point P.

2. Mar 1, 2006

### Staff: Mentor

Point P is equidistant from the two wires.

Therefore the x-components of the two fields should cancel.

(Thanks BerryBoy - not up to the necessary level of caffeine yet)

Last edited: Mar 1, 2006
3. Mar 1, 2006

### BerryBoy

I edited this post because I gave the answer...

"Jimmy Neutron": Do you know what a vector diagram is?
Or do you not know the vectors that the two wires create?

Last edited: Mar 1, 2006
4. Mar 1, 2006

### jimmy_neutron

I know what a vector diagram is, I do not know the vectors that the two wires create.

Last edited: Mar 2, 2006
5. Mar 2, 2006

### jimmy_neutron

The fact that the two x components cancel also makes sense but I dont know how to show that on the diagram. would i just write out that they cancel?
and if the two currents were both in the same direction would the arrow at P just be pointing to the left?

any help is appreciated.