A bar magnet of;magnetic moment 5Am2 has poles 20cm apart . calculate the pole strength

Dear Student,

magnetic moment, M=pole strength×magnetic lengthM=qm×2lmagnetic moment=5 Am2magnetic length=20 cm=0.2 m5=qm×0.2qm=50.2=25 Am

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Use  m = qm * 2l            ; 2l = 20/100 metre , m = 5 Am2
Therefore qm = 25
 

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