A physics teacher does the following emf demonstration. She has two students hold a long wire connected to a voltmeter. The wire is held slack, therefore that it sags with a large arc in it. When she says, "Start," the students begin rotating the wire as if they were playing jump rope. The students stand 3.0 meter apart, and the sad in the wire is about 1.5 meter. The motional emf from the "jump rope" is then measured on the voltmeter.
(a) Find a reasonable value for the maximum angular speed at which the students can rotate the wire.
(b) From this, find the maximum motional emf in the wire. Hint: Determine what field is involved in creating the induced emf?