Applications are as follows:
One, electro-acoustic devices: cell phones, televisions, stereos, headphones, and so on all of the audible speakers, these speakers are converted from electrical signals into acoustic signals a device. Mainly by the fixed permanent magnets, coils and conical paper cone.
When the sound in the form of audio current through the coil in the speaker, the speaker on the magnetic field produced by the magnet on the coil will produce force, the coil will be due to changes in the strength of the current to produce a different frequency of vibration, which leads to the cone of different frequencies and strength of the sound. The paper cone spreads the vibrations through the air, which then produces the sound we hear.
Second, electronic devices: cell phones, tablet computers hibernation holster, and so on.
Three, bags and holsters and many other items use magnets to attract and hold.
Four, the medical field: medical examination of the most commonly used nuclear magnetic **** vibration. Is the use of the body's own magnetic field and the instrument itself carries magnetic material, interaction, the formation of detection of manifestation, to help people see the cause of the lesion. Similarly in other medical treatment modalities, there are many traces of the application of magnets, such as acupuncture and magnetic therapy, magnetic sensory detector and so on.
Fifth, motors, motors and other electrical energy and kinetic energy conversion devices.
Sixth, life appliances, such as induction cookers, microwave ovens and other appliances, but also a large number of magnets.
Related:
If the temperature is too high, the magnetism completely disappeared, and after cooling it is generally not magnetic.
But if the temperature is not too high, the magnetism is just weakened, ordinary magnets, after cooling can also restore some, some can restore all, upstairs said the rice cooker insulation magnetic switch is the reason, after the rice is cooked, the thermal conductivity decreases, the temperature continues to rise, the rice cooker switch suction can not be cut off the power, but does not affect you next time you use.