A student fixes a white sheet of paper on a drawing board. He places a bar magnet in the centre and sprinkles some iron filings uniformly around the bar magnet. Then he taps gently and observes that iron filings arrange themselves in a certain pattern.
- Why do iron filings arrange themselves in a particular pattern?
- Which physical quantity is indicated by the pattern of field lines around the bar magnet?
- State any two properties of magnetic field lines
Answer:
a.
- Iron is a ferro-magnetic material. It is attracted to magnetic fields .
- When iron filings are placed in a magnetic field around a bar magnet, they behave like tiny magnets .
- The magnetic force experienced by these tiny magnets makes them rotate and align themselves along the direction of field lines .
b. The physical property indicated by this arrangement is the magnetic field produced by the bar magnet.
c.
- Magnetic field lines never intersect .
- Magnetic field lines are closed curves.
