There is no couple acting when two bar magnet | vedclass

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Question

(D) couple is defined as two equal and opposite forces acting along different lines of action,which produces a torque. For two bar magnets placed coax

Vedclass · Accepted Answer

The forces act along the same line

Vedclass · Answer

(D) couple is defined as two equal and opposite forces acting along different lines of action,which produces a torque. For two bar magnets placed coaxially,the magnetic force between them acts along the axis connecting their centers. Since the forces on the poles of the magnets act along the same line (the common axis),the perpendicular distance between the lines of action of the forces is zero. Therefore,the torque $\vec{	au} = \vec{r} 	imes \vec{F} = 0$. Thus,no couple acts on the magnets.

There is no couple acting when two bar magnets are placed coaxially separated by a distance because

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