Solve the given problem:
Problem: A single conducting wire is shaped into a circular loop with a diameter of 5.2 cm. At first, the wire is oriented so that its plane is perpendicular to a magnetic field of 0.64 T pointing straight up. In a time period of 0.20 s, the field is changed to one of 0.25 T pointing straight down.
Part A: What is the average induced emf in the coil?
I need help to find the average induced emf in the coil.