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

1. Jan 8, 2012

### Alhussein

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

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
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]

Last edited by a moderator: May 5, 2017
2. Jan 9, 2012

### SammyS

Staff Emeritus
Re: Biot-Savart's law of magnetic field " electromagnetic fields"

Your image is NOT viewable. I don't see it !!!

Last edited by a moderator: May 5, 2017
3. Jan 9, 2012

### Alhussein

Re: Biot-Savart's law of magnetic field " electromagnetic fields"

sry here's the picture. it's kinda small idk why. anyway in words the current goes from origin to point (8,0) then from point (8,0) to (8,4) then from point (8,4) to (0,4) then it goes from point (0,4) back to origin

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4. Jan 9, 2012

### cupid.callin

Re: Biot-Savart's law of magnetic field " electromagnetic fields"

Let the loop is ABCD
look at the above pic, By finding the angle of B and Bnet, you can find net mag field

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