A magnetised steel wire 31.4 cm long has...

A magnetised steel wire 31.4 cm long has a pole strength of 0.2 Am. It is then bent in the form of semicircle. Calculate the new magnetic moment.

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`pir=31.4cm`
`r=31.4/3.14=10cm=0.1m`
`M=m(2l)=(0.2Am)(2xx0.1m)`
`=0.04Am^2`

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