Magnetic field oriented

A bar 1.99 m long pivots in a vertical plane about one end. The first 0.63 m of this rod is made of nonconducting material, but the outer part are made of iron (see Figure). The apparatus is within a uniform 1.7 T magnetic field oriented at right angles to the plane in which the bar rotates. At what angular speed would you need to rotate this bar to generate a potential difference of 15.6 V between the ends of the iron segment? Express the answer with two decimal places.http://d2vlcm61l7u1fs.cloudfront.net/media%2F650%2F6504f222-8587-4a1b-af8c-44a633b8c608%2Fphpky1hMa.png