Physics 1402A/B Study Guide - Comprehensive Final Exam Guide - Page 3, Magnetic Field, Euclidean Vector

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Law of electric charges: like charges repel each other; unlike charges attract. An atom has a charge of zero because the # of protons is equal to the # of electrons. Law of conservation of charge: charges can be transferred from one object to another, but the total charge of a closed system remains constant. In a ion (cation) the # of protons must be greater than the # of electrons. In a ion (anion) the # of electrons must be greater than the # of protons. : magnitude of the charge on an electron or proton ( Neutral atoms have equal number of electrons and protons, but may not be chemically stable. Materials formed by bonds are naturally electrically neutral: # positive charges = # negative charges. Conductor: any substance in which electrons are able to move easily from one atom to another.

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