Electric Charge
Basic property of matter (just like, say, mass).
symbol: q , unit: = C (named after Coulomb)
Two kinds of charge:
+
• like charges repel
• opposite charges attract
- Elementary particles that make up atoms:
• Protons
+
charge +e = +1.6x10-19 C
• Neutrons
uncharged
• Electrons
charge –e = –1.6x10-19 C
-
Helium atom
Electric Charge
of 2
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