4. A long, straight wire is next to a conducting ring. They lie in the same plane. The current in the long wire changes according to the accompanying graph. You can see that, at time 0, the current ows up the page, but at time t2, the current mverses direction and ows down the page. current in straight wire I + . 0 a) Use Lenz's law to determine the direction of the induced current in the ring during the time intervals: time |---++ b) Suppose that the magnetic ux through the ring is 0.15 tesla - m2 at t = 0. And suppose that t2 t, = 0.30 5. What emf is induced in the ring during the time interval t]