1. The problem statement, all variables and given/known data A coil with 10 windings(radius 0,07m) is inside a homogenous magnetic(B=0,050T) field, it makes an angle of 90 degrees with the field lines so the magnetic flux is at it's max. Over a period of 0,050 seconds it gets turned by 180 degrees, what is the average induced voltage? 2. Relevant equations phi=B*A Uinduced=-N* dphi/dt 3. The attempt at a solution The area is 0.07²*pi= 0,015393804 m² So the magnetic flux in the situation before the turning is 0,015393804*0,050=0,0007696902 Wb (I dont normally write numbers like this) After it turns, this is the part i am unsure about, is the magnetic flux now -0,0007696902? because phi=B*cos(180)*A so the difference in magnetic flux is -2*(0,0007696902) Then Uinduced = -10 * (-2*(0,0007696902))/0.050 = 0,31 volts. Is this correct? I am verry sorry for my english. Thank you!