3. For a system of wires shown in Figure find the net force (magnitude and direction) exerted on 5mlength of the wire 3 by the other two wires. (20pts) 3A O.SA 13cm IA 3 4. A metal rod moves with constant velocity along two parallel metal rails connected with a strip of metal at one side as shown in Figure. A magnetic field B = 0.35 T points out of the page. If the rails are separated by distance L = 25 cm and the speed of the rod is v=55 cm/s, find a) the induced emf and direction of induced current (15pts) b) the amount of heat released in this system in 3 min if the rod has resistance of 18 2 and the rails have negligible resistance. (15pts) 6 BO V