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Factors Influencing the Electrical Resistivity of Graphite Pencil Lead…
Factors Influencing the Electrical Resistivity of Graphite Pencil Lead Grades 
Pencil Lead Grade (HB, 2B, 4B, 6B, etc.)
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Justification
Softer pencils (e.g. 6B) contain more graphite, which increases conductivity
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