Lecture 21a - Chapter 21 Electric Charge matter has a...

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Chapter 21 Electric Charge matter has a property we call “electric charge” (symbol q )
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Electric Charges and Forces Experiment shows there are two types of charge: we call them positive (+) and negative ( - ) REPEL REPEL ATTRACT Like charges repel, opposite charges attract. The greater the charges the greater the force. The closer the charges the greater the force
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Atomic structure Helium atom (neutral) 2e 2p Particle Charge Electrons negative Protons positive Neutrons none Neutral objects have equal numbers of protons and electrons Protons and neutrons are tightly locked within the nucleus. 2n Objects are usually neutral but can gain or lose electrons to acquire a net charge. An atom that has gained or lost electrons is called an ion .
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4 Calling protons (+) and electrons (-) is a convention. We could just as easily have called electrons (+) and protons (-), but Benjamin Franklin chose the other way and so we are stuck with it.
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5 SI unit of charge is the Coulomb [C]. Charge of one electron:
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This note was uploaded on 02/05/2011 for the course PHYS 220B taught by Professor Preminger during the Fall '10 term at CSU Northridge.

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Lecture 21a - Chapter 21 Electric Charge matter has a...

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