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

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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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