2. Which of the following uses electromagnets for continual motion?
a) Maglev train
b) Telephone
d) All of these
c) Refrigerator
Answers
Answer:
Answer is a.) Maglev train
Answer:
Electromagnets can also be used to create continual motion such as withelectric motors and maglev trains.
Explanation:
Microphones, speakers, headphones, telephones and loudspeakers. Electric motors and generators. Doorbells and electric buzzers. Computer hard drives.
In the home, by far the most common use of electromagnets is in electric motors. Think of all of those bits of electrical equipment with some kind of electric motor: vacuum cleaners, refrigerators, washing machines, tumble driers, food blenders, fan ovens, microwaves, dish-washers, hair driers.
(i) Electromagnets are used in a number of electric appliances such as electric bells and electric buzzers. (ii) They are used in electric motors, which find wide application in fans, washing machines etc. (iii) Very strong electromagnets are used in factories and cranes for lifting heavy iron pieces.
An electromagnet is a magnet that works with electricity. It can be switched on and off. The coils are nearly always made ofcopper wire because copper is such an excellent electrical conductor.
Electromagnets are very widely used in electric and electromechanical devices, including:
Motors and generators.
Transformers.
Relays.
Electric bells and buzzers.
Loudspeakers and headphones.
Actuators such as valves.
Magnetic recording and data storage equipment: tape recorders, VCRs, hard disks.
MRI machines.

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