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(N/A) magnetic compass needle is a small magnet that aligns itself with the Earth's magnetic field. When a bar magnet or a current-carrying loop is br

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(N/A) magnetic compass needle is a small magnet that aligns itself with the Earth's magnetic field. When a bar magnet or a current-carrying loop is brought near it,it produces its own magnetic field. The interaction between the external magnetic field and the compass needle's magnetic field exerts a torque,causing the needle to deflect.Salient features of magnetic field lines:$1$. Magnetic field lines emerge from the $N$-pole and enter the $S$-pole of a magnet.$2$. The strength of the magnetic field is represented by the degree of closeness of the field lines; closer lines indicate a stronger field.$3$. Magnetic field lines never intersect each other because if they did,there would be two directions of the magnetic field at the point of intersection,which is physically impossible.$4$. If field lines are parallel and equidistant,they represent a uniform magnetic field.

Why does a magnetic compass needle pointing North and South in the absence of a nearby magnet get deflected when a bar magnet or a current carrying loop is brought near it? Describe some salient features of magnetic lines of field concept.

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