Question

Pencil
Bulb
Cell
(i) The lead of pencil writes on the paper.Why?
Ans:​

Answer 1

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Because of Friction between the pencil's graphite lead and the paper

Answer 2

An important difference between pens and pencils is that the tip of a pencil is made of graphite (or lead) and pens have tips made of metal with ink coming out of the bottom. ... Because a hard core leaves behind less of the graphite-clay mixture on the paper, it will have a fainter mark than a softer core.