The field coils of a 6-pole DC generator each having 500 turns are connected in series. When the field is excited, there is a magnetic flux of 0.02 Wb/pole. If the field circuit is opened in 0.02 s and the residual magnetism is 0.002 Wb/pole, calculate the average voltage induced across the field terminals.

• A. 16200 V
• B. 18000 V
• C. 14300 V
• D. 3000 V