Advertisements
Advertisements
Question
How do you account for the following fact?
Soft iron keepers help to prevent the magnets from losing their magnetic properties.
Advertisements
Solution
In magnets, external fields like earth’s magnetic field can randomize the domains. Perhaps stray fields caused by flowing currents in nearby electric circuits can also disturb i the alignment of domains lying inside a magnet. Given enough time, such magnets may find their domains randomly oriented and hence their net magnetisation may get lost. A keeper for magnets is just a strong permanent magnet that keeps all the domains pointing the same way and realign those that may have gone astray and hence magnet, can retain its magnetism for a long time.
APPEARS IN
RELATED QUESTIONS
The magnetic field inside a long straight solenoid carrying current ______.
Explain the following :
The north end of a freely suspended magnetic needle gets attracted towards a piece of soft iron placed a little distance away from the needle.
State four properties of magnetic field lines.
Explain the method of plotting the magnetic field lines by using a small compass needle.
Repulsion is a surer test of magnetic condition of a body than attraction. Explain.
State any two properties of a magnet.
Magnetic lines of force never ______ each other.
"Magnetic field is a physical quantity that has both direction and magnitude." How can this statement be proved with the help of magnetic field lines of a bar magnet?
