Exercise 2. Consider a second current loop (with the same radius R and current!) parallel to the first loop and shifted by distance h in the positive z direction. What is the expression of Bz as a function of z for the second loop? Add the magnetic fields due to the two loops together and plot the resultant magnetic field. Experiment with the value of h and make the resultant eld between the loops as uniform {=flat top} as possible. What is the optimal value of h, according to your calculations