What is the difference between EMF and MMF?

Answer:

• MMF is the property of all electromagnetic circuits which follow Lenz/Faraday law. Like V=i*r(emf), MMF is given by F=flux*reluctance in the magnetic circuit; if any electromagnetic circuit generates flux in and outside it, it creates MMF, and if it is a closed circuit, a current will flow. 
• Emf is only electrical property, a static or dynamic charge can generate emf across the closed circuit(current should be flowing through it); it gives potential to electrons to travel through the circuit, for example, a cell/battery.
• After generating MMF, an electromagnetic circuit also works as a source, and the whole circuit pushes the electron to flow,  now it works as a PO cell and becomes EMF.