# Magnetic Field Strength

1. Jul 21, 2017

### Cici2017

1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution
Shouldn't they be the same? Does one being above the current and the other being below make any difference? I know when there is a higher density of magnetic field lines, the magnetic field strength is greater, but in this case, isn't it the same?

2. Jul 21, 2017

### Staff: Mentor

I think you need to explain more about the scenario. What is the import of the (d) that is mentioned? What is the significance of the two truncated rectangles at wither side of the image? Is there a pre-existing magnetic field involved that you haven't mentioned? Please state the original question in its entirety.

3. Jul 21, 2017

### Cici2017

Oh Yes, Sorry~

4. Jul 21, 2017

### Cici2017

5. Jul 21, 2017

### Staff: Mentor

Okay, so there is an existing field due to the magnets represented by the rectangles. Sketch in the pre-existing field and then the field due to the current. Where do they reinforce and where do they oppose? You'll probably want to use the right and rule for the magnetic field due to a current

6. Jul 21, 2017

### Cici2017

So the pre-existing magnetic field is from right to left (N to S) , and then the field due to the current is clockwise...how do I determine where they reinforce?

7. Jul 21, 2017

### Staff: Mentor

Sketch the vectors!