1. The problem statement, all variables and given/known data A loop of wire with an area 1cm^2 is centered within a larger loop of area 1m^2. Apower supply is generating current through the larger loop described by the function: I(t) = 40A * cos(2t/s * 2pi/5) Calculate EMF at time t = 3s 2. Relevant equations Magnetic flux = BAcos(theta) EMF = d/dt Magnetic Flux = d/dt BAcos(theta) B = ui/2r = (u/2r) 40A * cos 2t/s * 2pi/5) u = permeability of free space = 4pi * 10^-7 r = sqrt(area of circle/pi) 3. The attempt at a solution Some of the work done above, I set the equation of B into the emf then took the derivative with respect to time. EMF = 57 d/dt uA/2r cos(3t - 2pi/5)^2 EMF = 57*3* uA/2r cos(6t- 2pi/5) I confused myself over which A I was referring to and which radius as well. Thinking about this it makes sense that A is the smaller loop's area and r is the bigger loop's radius. Does this look correct?