We all know that magnets are widely used, but magnets are used in those fields, today let's list them one by one:
First, electroacoustic device: mobile phones, TV sets, audio, headphones and other sound speakers, this type of speaker is a device to convert electrical signals into sound signals. It mainly consists of a fixed permanent magnet, a coil and a tapered paper basin. When the sound in the form of audio current through the coil in the speaker, the magnetic field generated by the magnet on the speaker will produce force on the coil, the coil will produce different frequencies of vibration due to the change in the strength of the current, and then drive the paper basin to emit different frequencies and strengths of sound. The paper basin transmits vibrations through the air, and that's what makes the sound we hear.
Two, electronic equipment: mobile phone, tablet computer dormant holster, etc.
Three, bags and leather cases and many other items use magnets to absorb fixed.
Iv. Medical field: MRI, the most commonly used in medical examinations. It uses the magnetic field of the human body and the magnetic substances carried by the instrument to interact with each other and form detection and development to help people see the causes of the lesions. Similarly, in other medical methods, there are also many application traces of magnets, such as acupuncture and moxibustion magnetic therapy, magnetic sensing detector and so on.
Electric motor, motor and other electric energy and kinetic energy conversion devices.
Six, household appliances, such as induction cooker, microwave oven and other appliances, also use a large number of magnets.
