Why should the materials used for making permanent magnets have high coercivity ?

The substance used for making permanent magnet is

What type of magnetic material is used in making permanent magnets ?

Why do we prefer to use alnico for making permanent magnet ?

The material suitable for making electromagnets should have

What types of materials are used for making thermistor?

Which materials are used in making magnetic compass needle?

Give Scientific reasons: The material used for making fuse wire has low melting point

Questions based on paragraph : Sound is propagated in a material medium in the form of compression and rarefactions. One compression and one rarefaction together form one cycle of the sound wave. The number of cycles produced per second is called as frequency. A tuning fork is a two-pronged device which vibrates to produce sound when struck. The frequency of a tuning fork is decided by the dimensions of the prong and the material used for making the fork. When these sound waves reach ears of listener, his ear-drum vibrates. Accordingly specific signals are conveyed to the brain and the listener gets a sense of hearing sound. : Will two tuning forks of same dimensions but different material produce same type of sound when struck with the same force?

Questions based on paragraph : Sound is propagated in a material medium in the form of compression and rarefactions. One compression and one rarefaction together form one cycle of the sound wave. The number of cycles produced per second is called as frequency. A tuning fork is a two-pronged device which vibrates to produce sound when struck. The frequency of a tuning fork is decided by the dimensions of the prong and the material used for making the fork. When these sound waves reach ears of listener, his ear-drum vibrates. Accordingly specific signals are conveyed to the brain and the listener gets a sense of hearing sound. : If a sound wave consists of ten compressions and ten rarefactions, then how many cycles of wave will it form?