1. The problem statement, all variables and given/known data A horizontal desk surface measures 4.3 m by 2.0 m. If the Earth's magnetic field has magnitude 0.32 mT and is directed 45° below the horizontal, what is the magnetic flux through the desk surface? 2. Relevant equations Flux = B*A*Cos(a) Where A is the area, B is the magnetic field, 3. The attempt at a solution Flux = B*A*Cos(a) = (.32E-3 T) * (4.3*2.0 m^2) * ( Cos(45) ) = 0.00194596 T*m However, the my solution isn't correct and I'm convinced that I'm not doing anything incorrectly.