A single-loop circuit contains a battery (nominal emf 12V & internal resistance r), a motor (resistance Rm), and a cable (resistance Rc). The circuit is part of an experiment in your lab that is not working properly because the motor is turning too slowly. You are trying to determine which component is faulty. The information for this equipment says that the battery should have no more than 0.020 Ù internal resistance, the motor no more than 0.150 Ù resistance, and the cable no more than 0.040 Ù resistance. When you close a switch to turn the motor on, you measure 11.4 V across the battery, 3.0 V across the cable, and a current of 50 A. Which component is faulty?