A loop of wire of radius a = 50. mm has an electrical resistance R = 0.033 . The loop is initially inside a uniform magnetic field of magnitude B0 = 1.6 T parallel to the loop's axis. The magnetic field is then reduced slowly at a constant rate, which induces a current I= 0.20 A in the loop. How long does it take for the magnitude of the uniform magnetic field to drop from 1.6 T to zero?