Figure shows the extended view of a 2-pole dc machine with 10 armature conductors. Normal brush positions are shown by A and B, placed at the interpolar axis. If the brushes are now shifted, in the direction of rotation, to A' and B' as shown, the voltage waveform VAB will resemble B' (A) www. la laa 1 2 3 4 5 1 2 3 4 5 Rotation at speed w rad/sec (B) A'B' hom N 0 0 S 0.2 0.4 0.6 0.8 hmm. 0.2 0.4 0.6 0.8 (C) (D) A'B' 0 VW 0 10.2 0.4 0.6 0.8 1 0.2 0.4 0.6 0.8 wt