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## Homework Statement

The figure shows two very long straight wires (in cross section) that each carry a current of 3.19 A directly out of the page. Distance d1 = 6.00 m and distance d2 = 4.00 m. What is the magnitude of the net magnetic field at point P, which lies on a perpendicular bisector to the wires?

## Homework Equations

Biot-Savart's Law

## The Attempt at a Solution

[itex]{ B }_{ long,\quad straight\quad wire }\quad =\quad \frac { { \mu }_{ 0 }I }{ 2\pi r } \\ r\quad =\quad \sqrt { { (\frac { { d }_{ 1 } }{ 2 } ) }^{ 2 }\quad +\quad { { d }_{ 2 } }^{ 2 } } \\ { B }_{ total }\quad =\quad 2B\quad =\quad \frac { { \mu }_{ 0 }I }{ \pi r } \\ { B }_{ total }\quad =\quad 1.7695e-07[/itex]

I'm aware that I'm missing a sin(theta) in my multiplication, but why would I need to only specify a vertical component? The magnitude isn't only the vertical component.