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- Magnetic recording media: VHS tapes contain a reel of magnetic tape. The information that makes up the video and sound is encoded on the magnetic coating on the tape. Common audio cassettes also rely on magnetic tape. Similarly, in computers, floppy disks and hard disks record data on a thin magnetic coating.
- Credit, debit, and ATM cards: All of these cards have a magnetic strip on one side. This strip encodes the information to contact an individual's financial institution and connect with their account(s).
- Common televisions and Computer Monitors: TV and computer screens containing a cathode ray tube employ an electromagnet to guide electrons to the screen. Plasma screens and LCDs use different technologies.
- Speakers and microphones: Most speakers employ a permanent magnet and a current-carrying coil to convert electric energy (the signal) into mechanical energy (movement which creates the sound). The coil is wrapped around a bobbin attached to the speaker cone, and carries the signal as changing current which interacts with the field of the permanent magnet. The voice coil feels a magnetic force and in response moves the cone and pressurizes the neighboring air, thus generating sound. Dynamic microphones employ the same concept, but in reverse. A microphone has a diaphragm or membrane attached to a coil of wire. The coil rests inside a specially shaped magnet. When sound vibrates the membrane, the coil is vibrated as well. As the coil moves through the magnetic field, a voltage is induced across the coil. This voltage drives a current in the wire that is characteristic of the original sound.
Wiki User
∙ 13y ago
Wiki User
∙ 15y agoBar magnets are magnetised iron that have easily identifiable north and south poles. Because of this they are often used in teaching, for example that like poles repel, whereas opposites attract. There are many functions of magnets generally, two uses of bar magnets might include picking up pins, and classifying magnetic and non-magnetic metal in education.
Wiki User
∙ 11y agoThis is a really great question, so it's hard to limit the answer to only two!
- Audio speaker drivers
- Fridge magnets
- Microphones
- Motors
- Generators
Wiki User
∙ 12y agoA few magnets that could be around the home are:
- compass needle; for navigation
- fridge magnets
- inside a microwave
- bag belt buckle
- a credit car (magnetic stripe)
- inside the earth
- a car
There are many more !
Wiki User
∙ 12y ago1_Magnets are electromagnets.
2_It attracts the iron and steel.
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Can Permanent magnets be turned on and off?
Electromagnet which uses electric current can be turned on and off.
Which magnetic material can retain permanent magnetization?
False permanent magnets can but electromagnets need a running current A+
Objects that keep their magnetic properties for a long time?
A permanent magnet (in contrast to an electromagnet).
Permanent magnets and electromagnets both hold their magnetism for a long period?
the answer is false Permanent magnets will hold their magnetism for a long period of time. Electromagnets will only remain magnetic as long as current is flowing through them.
What is a true statement about the magnetic field between two magnets?
The south pole of one magnet is attracted to the north pole of the other magnet.
What are the uses for permanent magnets?
to make motors
Can Permanent magnets be turned on and off?
Electromagnet which uses electric current can be turned on and off.
What devices use permanent magnets?
Permanent magnets are used in food processing to remove metal fragments resulting from the manufacturing process. Magnets are also used in recycling centers to separate iron. A magnetic resonance imaging machine uses a magnet.
What types of magnets are harder to magnetize but retain magnetism much longer?
permanent magnets
What type of train uses magnets?
The maglev train floats over its track using an electromagnet. Maglev trains have managed speeds in excess of 370mph. A model of the maglev train uses two permanent magnets to get the model to float over the track.Describe how the magnets must be arranged to get the model Maglev Train to float.
What is true of permanent magnets?
Permanent magnets contain a current-carrying wire.
Are permanent magnets only attracted to other permanent magnets?
No, they are attracted to: Other permanent magnets Solenoids Iron Wires with current running through them
What are two uses for magnets?
Stereo speakers and generators.
Are electromagnetic magnets permanent?
No, electromagnets are not permanent.
How are permanent magnets bad?
Permanent magnets aren't bad. period. I do not know where you heard that but whatevs..
Described some uses for permanent magnets?
Permanent magnets can be used in a compass to find north, or they can be used to the magnetic field you need in a motor or generator. Spinning a wire at a right angle through a magnetic field creates electricity in the wire.
What are the applications of permanent magnets?
There are many applications of permanent magnets.Many children's toys have magnets to hold parts together, for example small trains.There was a game called pick-up sticks done with magnets.Apple Computer Co uses magnets to hold the power supply to laptops to help prevent damage when disconnecting the cord.Hard drives have magnets as part of the movement mechanism.Some of the more highly efficient motors and generators have permanent magnets. Also note that motors and generators can be made to be brushless to prevent the wear and maintenance on the brushes, often using permanent magnets. Windmill Generators.Blackberry uses a magnet to sense when the cell phone is in the cradle and to shut off the screen of their cell phones.Refrigerator Magnets.Removable Signs & Labels.javascript:void(0);Compasses.Parts Retrievals.Screwdrivers and tools that hold onto the screws.Simple clasps on purses, cases, etc.The uses of various types of magnets are almost endless.
