what is self-demagnetization ? how can we prevent it
Answers
Answer:
Self demagnetization occurs in the magnets when they are left for a long time. The magnetic field around the magnetic material tries to demagnetize it and thus the magnet gets partially demagnetize when left for long time.
The best method to use in prevention of self-demagnetization of a permanent magnet is by use of a keeper. Keepers were also commonly known as amateurs. They help in storing magnets safely, especially those that have low coercivity ( magnets that are extremely susceptible to stray fields)
Answer:
if poles are left free for a Very long period of time, they tend to become weaker. This is called self demagnetisation.Self demagnetisation is the process by which a magnet demagnetizes itself by the virtue of the opposing fields created within it by its own magnetism.
We can prevent self demagnetisation by using magnetic keepers which are two soft iron bars each on one pole of a magnet.