3. A current of 77.0 A is maintained in a single circular loop with a circumference of 2.00 m. A magnetic field of 0.89 T is directed parallel to the plane of the loop. What is the magnitude of the torque exerted by the magnetic field on the loops? 4. A transformer has 90 turns in the primary and 1500 turns in the secondary. If the primary voltage is 650 volts, what will the secondary voltage be? What will the current be in the primary if the secondary carries 9.0 A