In which of the following devices is an electromagnet used?
a. Electric tram
b. Loud speaker
c. Telegraph
d. Relay microphone

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b, c and d

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a and b

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All of the above

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Solution

The correct option is C All of the above
An electromagnet is a temporary strong magnet made from a piece of soft iron when current flows in the coil wound around it. It is an artificial magnet and loses its magnetism when the current is removed. It is used in electric trams, loud speakers, telegraph, relay microphone etc to enhance the effect.

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What is a Hearing Aid?

1. An electronic, battery operated device which can be worn by people with hearing loss in or behind their ear.

2. It makes sound louder so that a person with hearing loss can hear it better.

3. Receives sound through a microphone and converts it to an electrical signal.

4. Amplifies the electrical signal and retransmits them as sound using speakers.

Which of the above statements is correct?

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