(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

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The forces act along the same line

(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 $\vec{\tau} = \vec{r} \times \vec{F} = 0$. Thus,no couple acts on the magnets.

Class 12 Physics Magnetism and Matter Bar Magnet and Magnetic Dipole and Magnetic Moment

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

A
There are no forces on the poles
B
The forces are parallel and their lines of action do not coincide
C
The forces are perpendicular to each other
D
The forces act along the same line

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Bar Magnet and Magnetic Dipole and Magnetic Moment

$A$ bar magnet of magnetic moment $3.0 \, A-m^2$ is placed in a uniform magnetic induction field of $2 \times 10^{-5} \, T$. If each pole of the magnet experiences a force of $6 \times 10^{-4} \, N$,the length of the magnet is.....$m$

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$A$ cylindrical magnetic rod has length $5 \ cm$ and diameter $1 \ cm$. It has uniform magnetization $M = 5.3 \times 10^{3} \ A/m$. Its net magnetic dipole moment is nearly (take $\pi = 22/7$):

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An iron bar of length $L$ has a magnetic moment $M$. It is bent at the middle of its length such that the two arms make an angle of $60^{\circ}$ with each other. The magnetic moment of this new magnet is:

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$A$ bar magnet $AB$ is cut into two equal parts as shown in the figure. One part is kept over the other so that the pole $C_{2}$ is above $C_{1}$. If $M$ is the magnetic moment of the original magnet,the magnetic moment of the combination so formed is

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The torque on a bar magnet due to the earth's magnetic field is maximum when the axis of the magnet is

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

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$A$ bar magnet of magnetic moment $3.0 \, A-m^2$ is placed in a uniform magnetic induction field of $2 \times 10^{-5} \, T$. If each pole of the magnet experiences a force of $6 \times 10^{-4} \, N$,the length of the magnet is.....$m$

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