I can't seem to wrap my head around this question. Any help would be great. A coil consists of 20 turns, with a 10cm radius (all turns are uniform). It rotates uniformly around the z-axis at an angular speed of: w=20 rad/s A uniform magnetic field passes along the x-axis with a magnitude of B=0.3T. Find: a) The induced emf at any time moment t>0 if at t=0 the coil was in the yz plane. b) Direction of the induced current at t=0. First, b) is easy. The answer is zero, there is no induced current at t=0 because the coil is not moving through the field yet. For a) I started with this: E=-N*(dB flux/ dt) (where E=emf) Since B flux=BAcos(theta)=BAcos(wt) is sub this in to get: E = -NBAcos(wt) d/dt E = NBAwsin(wt) then sub in the given values for N, B, w and calculate A=pi*r^2 E = 20*.3*pi(.1m)^2*20*sin(20t) E = 1.2pi*sin(20t) is my final answer. Is this correct? Someone in my class has E=4pi*sin(20t) Can someone check my answer and offer some advice? Thanks in advance.