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(B) The pole strength $m$ of a magnet is directly proportional to its cross-sectional area $A$ (i.e.,$m \propto A$).When the magnet is cut into four p

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$m/2$

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(B) The pole strength $m$ of a magnet is directly proportional to its cross-sectional area $A$ (i.e.,$m \propto A$).When the magnet is cut into four parts such that the length and width of each part are halved,the cross-sectional area of each part becomes $A' = (width/2) 	imes (thickness/2) = A/4$ if we consider the cross-section as a rectangle. However,the question specifies the width is halved. If the magnet is cut along its length and width,the cross-sectional area $A$ is halved by the cut along the width. Thus,the new pole strength $m'$ is proportional to the new area $A' = A/2$.Therefore,$m' = m/2$.

If a magnet of pole strength $m$ is divided into four parts such that the length and width of each part is half that of the initial one,then the pole strength of each part will be

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