# Basic Magnetic Sources help

## Homework Statement

Wire #1 carries a current of 8.0A along the +x-axis. Wire #2 has a current of 6.1A along the +y-axis. What is the magnitude of the magnetic field at the point (1.4,1.3)m

## Homework Equations

I'm not sure if Long straight conductor will be the right formula to solve for magnetic field.

B = uo*I/(2*pi*r)

## The Attempt at a Solution

I spend an hour trying to solve this basic problem. I kept reading the textbook, reading my teachers notes, but doesn't seem helpful. They only show an example of one wire, but not two wires.
So then I found the r by using the Pythagorean theorem.
I understand that the current isn't the vector. but how am I suppose to solve the magnetic field if there are two currents, but both are perpendicular?

Thanks,

Byron

Redbelly98
Staff Emeritus
Homework Helper
First find the magnetic field that you would get from just one of the wires. Then do the same thing for the other wire.
Paying attention to the direction of each magnetic field you calculate, you then simply add them using vector addition. Remember that the two magnetic fields are vectors; don't simply add their values unless they happen to point in the same direction.

Hope that helps.

First find the magnetic field that you would get from just one of the wires. Then do the same thing for the other wire.
Paying attention to the direction of each magnetic field you calculate, you then simply add them using vector addition. Remember that the two magnetic fields are vectors; don't simply add their values unless they happen to point in the same direction.

Hope that helps.

yes I think I did that, though, but somehow I did

B= B * i(hat) + B* j(hat)

Is that right, because I'm getting one wrong. I think I'm not understand this.

Redbelly98
Staff Emeritus 