In DC motor,the field MMF is given by NI.N-no.of field
winding turns,I-excitation and both are constant.Then how
could the main flux decreases due to armature reaction.
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Answer Posted / avinash
By Lenz's Law: current in motion will oppose the cause of the motion. The armature current is in motion due to the MMF hence it will oppose (diminish) the MMF.
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