Assertion (A): A magnet remains stable, If it aligns itself with the fieldReason (R): The P.E. of a bar magnet is minimum, if it is parallel to magnetic field.
The magnet remains stable,if it align itself with the field as its potential will be minimum in that position.\\\\(\\mu=-\\vec{M}.\\vec{B}\\\\)=\\\\(-MB\\cos \\Theta \\\\)The potential energy will be minimum if \\\\(\\Theta =0\\\\)i.e. \\\\(-MB\\\\)\\\\(\ herefore \\\\) If it is parallel to magnet field