1. The problem statement, all variables and given/known data A horizontal rectangular surface has dimensions 3.10cm by 3.05cm and is in a uniform magnetic field that is directed at an angle of 34.5∘ above the horizontal. What must the magnitude of the magnetic field be in order to produce a flux of 4.5E-4 Wb through the surface? 2. Relevant equations Magnetic Flux = BAcos(θ) 3. The attempt at a solution Using the above equation, I solved for B, getting B=Flux/Acos(θ) I then plugged in my numbers: (4.5*10^-4)/((.0305)(.031)cos(34.5)) and got that B should equal 0.5775T. However, it says the answer is wrong, any ideas what I did wrong?