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THE LEAD OF THE PENCIL WRITES ON THE PAPER BECAUSE LEAD IS MADE UP OF GRAPHITE. WHICH HAS A PROPERTY OF ATTRACTION AS WELL IS USED IN PENCILS FOR WRITING ..
IN THE GIVEN CIRCUIT THE BULB GLOWS BECAUSE LEAD CONDUCTS ELECTRICITY THE COMPOSITION OF LEAD IS IN SUCH A WAY THAT IT HAS FREE ELECTRONS SO THAT IT COULD CONDUCT ELECTRICITY.
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