A steel wire, of length l has a magnetic moment M. Its is then bent into a semi-circular arc. The new magnetic moment is
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If m is strength of each pole , then magnetic moment M = m `xx`l When the wire is bent into L shape , effective distance between the poles = `sqrt(((l)/(2))^(2) + ((l)/(2))^(2)) = (l)/(sqrt2)` `therefore` New magnetic moment `M' = m xx (l)/(sqrt2) = (M)/(sqrt2) " "` (m will remain unchanged )
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