A long, vertical magnet is placed at a perpendicular distance of 0.8m from the centre of a horizontal magnetic needle of length 0.12 m ad pole strengt
A long, vertical magnet is placed at a perpendicular distance of 0.8m from the centre of a horizontal magnetic needle of length 0.12 m ad pole strength 0.6Am. If the moment of the couple acting upon the needle is `72 xx 10^(-7)Nm`, Find the pole strength of the long magnet.
[Hint: Since the magnet is long, the effect of the distance pole may be neglected.]
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