The figure below shows an end view of a single-turn square loop of metal wire in the center of and coaxial with a very long solenoid with a circular cross section. The solenoid is 21.0 cm long, has a radius r = 3.00 cm, and consists of 126 turns of wire. The length of each side of the square loop is € = 1.50 cm. (a) The current in the solenoid is 4.00 A. What is the magnetic flux through the square loop (in T. m²)? T.m² (b) The current decreases from 4.00 A to zero in 4.00 s. What is the magnitude of the average induced emf in the square loop (in V) over this time?