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 silent features of magnetic lines of field concept.

Explanation

When a magnetic compass needle points North and South in the absence of a nearby magnet or a current loop, it is acting upon by the Earth's field only. But in the presence of a magnet or a current loop (which also has a magnetic field), the Earth's magnetic field near the compass is modified and the needle is deflected from N-S direction. For salient features of magnetic field lines.