A dc motor generates a back emf of 200 V. It is controlled by a pair of thyristors in a single-phase full-wave center-tapped circuit. The voltage between the center tap and each anode is 175 V ac, for firing angle 60° and Ra = 0.8 Ω, the armature current will be
1
7.88 A
2
12.52 A
3
14.14 A
4
15.45 A