Acoilof 500 turns abd resistence of 20 ohm is wound uniformally on iron ring of mean circumference 50 cm and cross sectional area is 4cm^2.it is connectedto a 24V supply. under the condition the relitive permability of iron is 800. calculate the value of(a)mmf of the coil(b)megnatic force (c)total flux of iron core (d) reductenceof iron ring
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