1. The problem statement, all variables and given/known data Two coaxial circular coils of radius R = 15 cm, each carrying 4.0 A in the same direction, are positioned a distance d = 20 cm apart, as shown in the figure. Calculate the magnitude of the magnetic field halfway between the coils along the line connecting their centers. (μ0 = 4π × 10-7 T ∙ m/A) 2. Relevant equations 3. The attempt at a solution so: B= [(4*∏*10-7)(4.0)(0.152)]/[2*(0.152+0.22))3/2] which is = 3.62 x 10-6 not near any of the options. Is this a very wrong approach? Thanks!