- #1

georgeh

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**I made a typo. I meant, Biot- Savar Law( sorry ).1. Homework Statement**

A conductor in the shape of a square Loop of edge length

*l*= 0.400 m carries a current I = 10.0A. Calculate the magnitude and direction of the magnetic field at the center of the square.

## Homework Equations

db = u_0/(4pi) * I d

**s x r_units vector**/r^2

## The Attempt at a Solution

I know that that I can take out the constants, u_0/4*pi and the I and integrate d

**s x r_unit vector**/r^2

I know also that all four sides create a magnetic field B into the page. I just don't know how to state my r. I also know that

db = k* ds sin(thetha) /R^2

( with all the constatnts factored out, k = all the constants), but I am not sure how thetha varies, i am assuming r would be l/2 if we draw our axis at the point p. but i am not sure how thetha varies.. nor ds. any help would be appreciated.

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