1 When running at its operating speed a 200-V dc motor with an armature whose resistance is 120 the motor when it is operating normally? draws a current of 200 A What is the back emf of 2. An AC generator has 70 rectangular loops on its armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1100 m about a parallel to the long side. If the loop rotates in a uniform magnetic field of 04 T. which is perpendicular to the son of rotation, what will be the maximum output voltage of this generator? Volts 3 A 150 cm diameter cod consists of 25 turns of cylindrical copper wire 2 60 mm in diameter A uniform magnetic field perpendicular to the plane of the coil changes at a rate of 7.00 x 10" T/s Determine the current in the loop in mill-amps (the resistivity for copper is 1.72 x 100m) MA 4 A length of 20-gauge copper wire (of diameter 0 8118 mm) is formed into a circular loop with a radius of 150cm A magnetic field perpendicular to the plane of the loop increases from zero to 120 m in 0.28 . Find the average electrical power dissipated in the process