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

A rectangular loop carrying 10 A of current is placed on z=0 plane as shown in figure . Evaluate H at a) (2,2,0)

b) (4,2,0)

c) (4,8,0)

d) (0,0,2)

2. Relevant equations

the used equation to answer the problem is

H= I/4∏ρ * (cosθ2-cosθ1) a∅

where ρ is the perpendicular distance between the line carrying current and the point which we need to evaluate H at

a∅=al X aρ

where aρ is a unit vector along the perpendicular line from the line current to the field point

3. The attempt at a solution

i already answered a,b,c and i'm sure about the answers

but the number d is kinda hard . i solved it with many ways but it seems that i'm misunderstanding something here so i hoped that some1 can help me and tell me

what's the ρ and aρ is this situation . i just need to know how to get ρ and aρ in the future so i hope whoever answers will concentrate on showing me how to get it . thanks for helping me

http://www.mediafire.com/?21cwcskwt3yect4 [Broken]

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# Biot-Savart's law of magnetic field electromagnetic fields

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