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A magnetised steel wire `31.4cm` long has a pole strength of `0*2Am`. It is bent in the form of a semicircle. Calcualte its magnetic moment.

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A magnetised steel wire `31.4cm` long has a pole strength of `0*2Am`. It is bent in the form of a semicircle. Calcualte its magnetic moment.
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Here, `l=31*4cm`, `m=0*2Am`,
`M=?`
Let r be radius of semicircle.
`:. L=pir, r=l/pi=(31*4)/(3*14)=10cm=0*1m`
`M=mxx2r=0*2xx2xx0*1=0*04Am^2`
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