A toroidal.iron ring has a uniform cross-sectional area of 50 mm?, and a mean magnetic path wide
of 100 mm. The ring has an air-gap of 1 mm. The ring is excited with a de current of 1A through a
coil of 100 turns wound uniforinly along its length. The iron may be assumed to be perlect
magnetic material. The effect of fringing at the gap may be assumed to increase the effective area
of magnetic flux at the gap by 10%. Evaluate.
8
The exciting mmf of the coil, 100 AT
(in)
(in)
(iv)
The effoctive reluetance'of the magnetic circuit, 14.4686 7 10 AT/ub.The magnetic flux in the air-gap, 6-9 | * 125
The inductance of the coil, 0.69 MH The enerey stored in the magnetic field under the above excitation. 3.45-