A student fixes a sheet of white paper on a drawing board using s… - Vidyadip

Question

A student fixes a sheet of white paper on a drawing board using some adhesive materials. She places a bar magnet in the centre of it and sprinkles some iron filings uniformly around the bar magnet using a salt sprinkler.
On tapping the board gently, she observes that the iron filings have arranged themselves in a particular pattern.
(a) What makes iron filings arrange in a definite pattern?
(b) Draw a diagram to show this pattern of iron filings.
(c) How is the direction of magnetic field at a point determined using the field lines? Why do two magnetic
field lines not cross each other?
OR
How are the magnetic field lines of a bar magnet drawn using a small compass needle? Draw one magnetic field line each on both sides of the magnet.

✓

Answer

A student fixes a sheet of white paper on a drawing board using some adhesive materials. She places a bar magnet in the centre of it and sprinkles some iron filings uniformly around the bar magnet using a salt sprinkler. On tapping the board gently, she observes that the iron filings have arranged themselves in a particular pattern.
(i) The bar magnet kept at the centre of board has its magnetic field around it. The iron filings sprinkled on the board
experience a force on them due to the magnetic field of bar magnet. So, when the student taps the board the iron filings align themselves according to the magnetic field lines of the bar magnet.
(ii)

(iii)The direction of a magnetic field at a point is determined by placing a small compass needle. The N - pole of compass
indicates the direction of magnetic field at that point.
Two magnetic field lines do not intersect each other because if there was point of intersection, The compass needle would point towards 2 directions.
OR

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