radius of a pencil lead in standard form
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d/2 is answer......,.......
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Generally, it's 0.8 in Mechanical pencil but you will get 0.5
or
Using a digital caliper specified (but not assured by me) to be accurate to +/- .02mm, I measured the diameter of the graphite "lead" in a Dixon Ticonderoga #2 pencil. I got a reading of 2.20 mm.
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