Two similar bar magnets $P $ and $Q$ , each of magnetic moment $M,$  are taken, If $P$ is cut along its axial line and $Q$ is cut along its equatorial line, all the four pieces obtained have

A small magnetised needle $P$ placed at point $O$ and the arrow shows the direction of its magnetic moment. The other arrow show different position (and orientation) of another identical magnets $(Q)$. In which configuration system is not in equilibrium

A magnetic needle of negligible breadth and thickness compared to its length, oscillates in a horizontal plane with a period $T$. The period of oscillation of each part obtained on breaking the magnet into $n$ equal parts perpendicular to the length is

Following figures show the arrangement of bar magnets in different configurations. Each magnet has magnetic dipole moment $\vec m$ . Which configuration has highest net magnetic dipole moment

Two identical short bar magnets, each having magnetic moment of $10\, Am^2$, are arranged such that their axial lines are perpendicular to each other and their centres be along the same straight line in a horizontal plane. If the distance between their centres is $0.2 \,m$ , the resultant magnetic induction at a point midway between them is$({\mu _0} = 4\pi \times {10^{ - 7}}\,H{m^{ - 1}})$

Draw field lines on a bar magnet, a current carrying finite solenoid and electric dipole.