Why headphones required to turn on Radio in mobile _Tamil, How AM, FM radios work?

This video will explain about complete working of Electromagnetic waves of Radios and also explain why headphone required to turn on the radio in mobile phones.
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Time stamp
00:00 - Intro
00:30 - Electromagnetic waves
01:29 - Types of EM waves
03:06 - AM, FM Radio
04:24 - Why we use FM
04:58 - Why antenna required for FM
07:11 - Why headphones?
08:53 - Inbuilt radio
10:08 - Turn on FM without headphones
10:42 - End

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Видео Why headphones required to turn on Radio in mobile _Tamil, How AM, FM radios work? канала Engineering Facts