Wireless charging by a wave
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When we use mobile phones, we can be provided with a no. so that when we go for its call the antenna set up for it could send a wave ( may be micro, radio, infrared or any other ) of particular frequency that transfer packets of energy like we have in light and this can be received by a small device ( or something like solar panel made of silicon which gets activated when light falls on it and electron starts flowing and current flows ) which gets activated and hence can be used to charge the battery of mobile phones.
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