PHYSICS 112 - REVIEW FOR EXAM 1ELECTRIC CHARGESElectric charges are positive, negative, or zero; they are measured in coulombs (symbol: C). Electric charges are quantized:every object in the universe has a electric charge , where 0, 1, 2, . . . is an integer and 1.610C. Electrons,;œ „8/8œ/œ ‚19neutrons, and protons have charges 0,respectively. Electrical and magnetic forces act on charged particles./ß/ßELECTRIC FORCESCoulomb's law: The electric force beween two particles of electric charge and separated by a distance has magnitude;;<12Jœ5œ ‚5; ;<e1¸¸##, where 910 N-m /C is a universal constant.922The forces on two positive or two negative charges is repulsive, directly straight away from each other. The forces betweena positive and a negative charge are attractive, directed towards each other.ELECTRIC FIELDSThe .electric field Itat a point where the electric force on a small charge (positive or negative) is is given by ;JtIœtJt;The electric field has units of N/C.
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