1. The problem statement, all variables and given/known data A patient's breathing is monitored by wrapping a 200 turn flexible metal belt around the patient's chest. When the patient inhales, the area encircled by the coil increases by .0039m^2. The magnitude of the Earth's magnetic field is 50x10^-6 T and it makes an angle of 50 degrees with the direction perpendicular to the coil. If the patient requires 1.5s to inhale, find the average emf induced in the coil. 2. Relevant equations Magnetic flux=BA. EMF= N x change in(MagFlux)/change in time. 3. The attempt at a solution I don't understand why i'm not gettting this problem it seems pretty straight forward. I do Magnetic Flux = BA so (50x10^-6)(.0039)(cos40) which equals 1.5x10^-7. Then I use the 2nd equation and emf = 200(1.5x10^-7)/1.5 and I get 2x10^-5 V. The answer is supposed to be 16.7x10^-6 V though.