Electrical Machines
Field winding of a DC series motor is usually provided with thick wire

 to provide large flux.
 in order to reduce eddy current to provide large flux.
 as it carries large load current.
 to reduce the insulation of materials.

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Electrical Machines
When the supply terminal of a DC shunt motor are interchanged

 The motor will run much faster in the same direction.
 The direction of rotation will reverse.
 The motor will stop.
  The motor will run at its normal speed in the same direction as before.

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