Question

Assertion (A) : Magnetic field lines never intersect each other. Reason (R) : If they intersect, then at the point of intersection, the compass needle would point towards two directions, which is not possible.

A student fixes a sheet of white paper on a drawing board. He places a bar magnet in the centre of it. He sprinkles some iron filings uniformly around the bar magnet. Then he taps the drawing board gently and observes that the iron filings arrange themselves in a particular pattern.

Why does a compass needle get deflected when brought near a bar magnet?

Draw magnetic field lines around a bar magnet.