The figure shоws а strаight wire, а part оf which is bent intо the shape of a circle. The radius of the circle is 2.0 cm. A uniform magnetic field of magnitude 0.55 T is directed perpendicular to the screen. The ends of the wire and then pulled rapidly so that the radius of the circle shrinks to zero in a time of 4.9 ms. Find the magnitude of the average emf induced in the wire.