Magnetic Properties of Materials | Old is Gold | XII

Short Questions

1.      What are magnetic domains?
2.      What is angle of dip? How does it vary from the equator to the poles/
3.      Define angle of dip and angle of declination at a place.
4.      How does dip vary from place to place on earth`s surface?
5.      Why does a bar magnet not retain its magnetism when it is method?
6.      Why does a magnet lose its magnetism when heated to high temperature?
7.      Above Curie temperature a ferromagnetic material becomes paramagnetic. Why?
8.      What are the characteristics of a Ferro-magnetic substance?
9.      A permanent magnet can be used to pick up a string of nails, tacks or paper clips, even though these are not magnets by themselves. How can this be?
10.  A ferromagnetic substance becomes paramagnetic above Curie temperature. Explain why?

Long Questions

1.      The angle of dip in Britain is greater than that in Kathmandu. Why?