Assuming a uniform distribution of current over the armature surface conductors, the shape of the resultant armature m.m.f. in space of a loaded dc machine is a symmetrical

• A. Triangular wave with its peak along the inter-polar axis
• B. Triangular wave with its peak along the pole axis
• C. Rectangular wave with its central axis coinciding with the inter-polar axis
• D. Rectangular wave with its central axis coinciding with the pole axis