Field due to a Current

1. Feb 21, 2012

GeorgeCostanz

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

A current of 4.60 A is located at the origin, flowing along the z axis. (A positive current flows in the + k direction.) Find the magnetic field at the point (2.79,3.89) cm.

Enter the x and y components of the field:

2. Relevant equations

B = μ$_{°}(i)$/(2∏r)

μ$_{°}$ = 4∏ x 10^-7

3. The attempt at a solution

used the Pythagorean theorem to find r = 0.04787

used ampere's law to find B = 1.92x10^-5 T

found θ at 54.35°

from there i found

Bx = Bcosθ = 1.12x10^-5 T
By = Bsinθ = 1.56x10^-5 T

not sure where i'm going wrong, thanks

2. Feb 22, 2012

kushan

How did you find angle?

3. Feb 22, 2012

GeorgeCostanz

arctan(3.89/2.79)

4. Feb 22, 2012

kushan

George , what will be the direction of magnetic field at that point,?

5. Feb 22, 2012

GeorgeCostanz

i'm not sure, i'm struggling with all this right hand rule stuff

6. Feb 22, 2012

kushan

See , you need to know is ,
The magnetic field will form concentric circles around the wire ,
and the direction of magnetic field at any point will be the tangent of the circle at that point .

7. Feb 22, 2012

kushan

This is the figure

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