For a given 4-pole machine, carrying armature current 56.82 A, with 846 conductors. The mean flux density in the air gap under the interpoles is 0.5 Wb/m^2 on full load and radial gap length is 0.3 cm. Ampere-turns required for an interpole is ____________
(a) 3198
(b) 2099
(c) 4198
(d) 6297
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