PHYS 102 1nd Edition Lecture 3 Outline of Last Lecture I. Properties of Electric ChargesII. Coulomb’s LawOutline of Current Lecture III. The Electric FieldIV. Electric Field LinesCurrent LectureIII. The Electric FieldA. Coulomb’s Law 1. F = K[(q1 X q2)/(r2)] F: Electric force E: Electric fieldB. Gravitational Force 1. Gravitational Force (Fg) is between two masses M (Earth) and m (massnear Earth)a. Fg= G[(M X m)/(r2)]b. Electric Force = K[(q1 X q2)/(r2)]C. Electric Field (E): an electric disturbance in a region surrounding a charge (sayq1). If you place a second charge (say q2) in this region, the second charge (q2) will feel the electric force of q1. 1. Fon q2 = q2Eby q12. F = qE3. The electric field is stronger near q1, than farther from it. 4. The electric field (E) produced by q1 will affect q2, if q2 is in the field of q1. IV. Electric Field Lines A. Electric field line diagrams 1. The number of E-lines is proportional to the strength (magnitude) of Q. These notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.2. When there is a +Q, the E-lines are pointing outward. When there is a –Q, the E-lines are pointing inward. 3. When there are two positive E-line diagrams side by side, the E-lines would collide, but instead they turn to avoid each other. 4. When there is one positive E-line diagram and one negative E-line diagram, the Electric field goes from the positive charge toward the negative charge. 5. Good example on pg. 543
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