Charge is a fundamental property of matter. Two types: positive (protons) and negative (electrons). Like charges repel, unlike attract. Charge is quantized: q = ne (n is integer, e = 1.6ร10โปยนโน C). Charge is conserved: total charge in isolated system is constant. SI unit: Coulomb (C). 1 C is very large โ typical charges are ฮผC or nC.
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