1. The problem statement, all variables and given/known data 2. Relevant equations emf = i (induced) R emf = - d(Ф)/dt Ф = B (dot) A B = μi/(4piR) 3. The attempt at a solution emf = - d(Ф)/dt emf = - d( B (dot) A )/dt emf = - d[ (μi/(4piR) * A ]/dt, A and B are perpendicular Really not sure how to proceed from here as there are multiple derivatives (di/dt dR/dt and dA/dt) that I don't quite get. Thank you very much.