there's a wire shaped as a circular loop that carries a current I=ct. half the loop has radius A and at 45 degrees the radius of the second half of the loop changes to b. Find the retarded potentials V(t) and A(t) The way i thought of approaching this is by dividing the loop into two sections and calculating the retarded potentials separately for each half of the circle. So, I would have two integrals of the form dl, and each integral would have the limits of integration associated with each part of the loop my only concern is that is one single wire, so I don't know if my initial approach would be correct. any help appreciated thanks.