A single strand of wire of adjustable length is wound around the circumference of a round balloon that has a diameter of 16.0 cm. A uniform magnetic field with a magnitude of 1.60 T is perpendicular to the plane of the loop. If the balloon is blown up such that its diameter and the diameter of the wire loop increase to 26.0 cm in 0.050s, what is the magnitude of the average value of the emf induced in the loop?