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The length of a magnetic circuit of a relay is 25 cm and the cross-sectional area...

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Electrical Engineering

  1. The length of a magnetic circuit of a relay is 25 cm and thecross-sectional area is 6.25 cm2. The length of theair-gap in the operated position of the relay is 0.2 mm. Calculatethe magnetomotive force required to produce a flux of 1.25 mWb inthe air gap. The relative permeability of magnetic material at thisflux density is 200. Calculate also the reluctance of the magneticcircuit when the relay is in the unoperated position, the air-gapthen being 8 mm long (assume μr remains constant).

[2307 AT, 1.18 x 107 AT/Wb]

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