Solving a Biot-Savart Problem: Idx, r and dB

[ermines]

i personally think that this is just a very simple problem since the problem only requires plugging the right values into the formula. I'm just having trouble with one minor detail.

Homework Statement

For the current element Idx(ax+ay) A situated at P(1,-2,2), find the magnetic flux densities at P(2,-1,3).

Homework Equations

Biot-Savart

dB = (K)(IdI x r)/rr

The Attempt at a Solution

my only problem in here is that I'm having a hard time figuring out what idx is? do i just substitute it for Idl then just get its cross product with r and so on? also, do i need to actually integrate it to get B?

that is all and thanks.

 

[marlon]

What is Idx(ax+ay) ?
What kind of current element do we have here ? Wire, infinite wire, semi infinite wire ?

marlon

 

[ermines]

hmmm...never thought of that question, marlon...

i suppose that it is an infinite wire? or can't it just be just a point with such property? will it actually make a difference?