(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

A conductor in the shape of a square loop of edge length l = 0.360 m carries a current I = 10.0 A. Calculate the magnitude and direction of the magnetic field at the center of the square.

2. Relevant equations

∮B⃗ ⋅dr⃗ =μ0 Ienclosed Ampere's Law

B=μ04π ∫I dl⃗ ×rˆr2 Biot-Savart

3. The attempt at a solution

I have seen the solution and gotten the correct answer using the formula for the B field surrounding a long, thin, conductor, derived from the Biot-Savart law.

B=(mu_0*I)/(2*pi*a) , where a is the distance from the wire to point in question.

My question is why is not possible to use Ampere's law to solve this problem. I am still in the process of tying to learn/understand Ampere's law.

Thank you

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Ampere's Law vs Biot-Savart arouns a Square

**Physics Forums | Science Articles, Homework Help, Discussion**