A ring of cross-sectional area 7 x 10-3 m2 has a length 0.4m is made of steel with relative permeability of 3500. The ring also has an air gap of 0.01m (so total average circumference = 0.41m). It is wound with a coil of 100 turns connected to a 3A supply. a) Calculate the mmf b) Calculate the reluctance for the steel ring c)Calculate the reluctance for the air gap d) Calculate the flux in the circuit e) Calculate the flux density in the air gap. f) If a wire is placed in the gap perpendicular to the magnetic field and a current of 2.5 A is applied, what is the force exerted on the wire?

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DC Generator

An electromechanical machine which converts input mechanical energy to respective output electric energy is called a generator.