1. The problem statement, all variables and given/known data [PLAIN]http://i27.lulzimg.com/ac8f155fa0.jpg [Broken] [PLAIN]http://i27.lulzimg.com/b5f4ac2fce.jpg [Broken] 2. Relevant equations 1. B = ((mu(0) * N * I )) / L ,, 2. (mu(0) / 4pi)*((I*(delta(S) cross r(direction)))/r^2) 3. The attempt at a solution im not really sure which equations to use. i tried to input the variables a and z into the second equation, but im sure if it is correct or not.