The magnetic field lines due to a bar magnet are correctly shown in

What happens to the force between two magnetic poles when their pole strength and the distance between them are both doubled?

$A$ short bar magnet has a length $2l$ and a magnetic moment $10 \text{ Am}^2$. Find the magnetic field at a distance of $z = 0.1 \text{ m}$ from its centre on the axial line. Here,$l$ is negligible as compared to $z$.

$A$ long magnet is cut into two parts in such a way that the ratio of their lengths is $2 : 1$. The ratio of the pole strengths of both the sections is

$A$ cylindrical rod magnet has a length of $5 \, cm$ and a diameter of $1 \, cm$. It has a uniform magnetization of $5.30 \times 10^3 \, A/m$. What is its magnetic dipole moment?

Two identical thin bar magnets,each of length $l$ and pole strength $m$,are placed at a right angle to each other with the north pole of one touching the south pole of the other. The magnetic moment of the system is