S13Phys2BaLec21B

# But for historical reasons we still consider e the

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But for historical reasons, we still consider e the fundamental unit of charge.

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Electrical Charge The SI unit of charge is the Coulomb (C). e = 1.602x10 –19 Coulombs. Electrons have a charge of –e. Protons have a charge of +e. Neutrons have no charge.
Electrical Charge Many things can inherently carry positive and negative charges. Yet, the basic carrier of positive charge in nature is the proton. Protons usually do not move from one material to another because they are held firmly in the nucleus. The basic carrier of negative charge in nature is the electron. Usually an object gets charged by gaining or losing electrons.

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Electrical Charge No matter how charge moves, it is always conserved. This phenomenon is known as conservation of charge. I cannot create nor destroy net charge. I can exchange charges between objects. Objects become charged because negative charge is transferred from one object to another.
Electrical Charge We observe conservation of charge in experiments often. For example look at the following particle physics experiment: Charged particles are represented by the lines. We note that two particles emerged from a neutral one. V0

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Large Objects Everyday objects are composed of protons, neutrons, and electrons. This means that every object has many, many positive and negative charges in it even though it may be electrically neutral overall.
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