$A$ magnet is placed in iron powder and then taken out,then maximum iron powder is at

$A$ magnetized wire of magnetic moment $M$ and length $l$ is bent in the form of a semicircle of radius $r$. Then its new magnetic moment is:

If a bar magnet of pole strength $m$ and magnetic moment $M$ is cut equally $5$ times parallel to its axis and again $3$ times perpendicular to its axis,then the pole strength and magnetic moment of each piece are respectively

$A$ bar magnet of magnetic moment $5 \,Am^{2}$ is placed in a uniform magnetic induction $3 \times 10^{-5} \,T$. If each pole of a magnet experiences a force of $2.5 \times 10^{-4} \,N$, then the magnetic length of the magnet is: (in $\,m$)

$A$ magnetized wire of magnetic moment $M$ and length $L$ is bent into an arc of a circle subtending an angle of $60^o$ at the center. The new magnetic moment is:

The force between two identical bar magnets whose centres are $r \ m$ apart is $4.8 \ N$,when their axes are in the same line. If the separation is increased to $2r$,the force between them is reduced to . . . . . . $N$.