A uniformly distributed winding on the stator has three full-pitched coils, each coil having N turns and each turn carrying a current I. The mmf produced by this winding is

• A. sinusoidal in waveform with an amplitude 3 NI
• B. Sinusoidal in waveform with an amplitude \(3\frac{{NI}}{2}\)
• C. trapezoidal in waveform with an amplitude 3 NI
• D. trapezoidal in waveform with an amplitude \(3\frac{{NI}}{2}\)