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1. What is the role of the two conducting stationary brushes in a simple electric motor?
 
The brushes are connected to the battery and hence they  the battery and  to the armature of the coil.
  
2. What is the difference between a direct current and an alternating current? How many times does AC used in India change direction in one second?
 
Direct current always  where as the alternating current . The frequency of AC in India  is and in each cycle it alters direction . Therefore AC changes direction  times in one second.