Magnetic Field's Equation's querry.

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Homework Statement


B = (miu0)I / 2(pie)(rho) X an

how do i know the direction of the an? if it is ax, ay or az?


Homework Equations

 
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Can you restate your question?

The field from a long straight current-carrying wire is given by:

B = \frac{\mu_0 I}{2 \pi r}

Does your question relate to this?
 
yes indeed. and besides that equation, there's suppose to be a unit vector, right? i was wondering how do i know the direction of the unit vector.
 
awesome! thanks alot.

at least something good happened today. haih. i just got robbed.
 

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