# Chapter 16 Physics Flashcards

Terms Definitions
 Law of Electrostatic Object with similar charges repel each other, opposites attract Positive Net deficit of electrons that a free to move Negative Net excess Conductor Readily transfers electrons because molecular structure allows them to move freely Insulator Poorly transfers electrons because they are bound tightly to orbits Conduction Electrons from source move into substance Induction Electrons repel due to proximity of another charged object Coulomb Measure of charge (Q) equal to 6.25x10^18 electrons One electron has a charge of -1.60x 10^-19 coul ( Coulomb I micro coulomb (uc= 10^18) often used because coulomb is such a large change Coulomb's Law of Electrostractic The force between two point charges is directly proportional to these magnitudes and inversely proportional to square of the distance between. Equation of Coulomb's Law F= kQ,1Q,/ d^2 Q,1 Q,2 Charges in coulombs (keep signs) d= Distance in meter k= in a vacuum 8.987x10^9 nm^2/coul^2. k= in air 8.93x10^9 nm^2/coul^2 F= Force Force is negative For attraction Force is positive For repulsion Electric field Exists in the space around charged object exert a force on other proximate charged objects Lines of force Exist out of positive and into negative, are normal to surface tangent at a point would show the orientation of the field at the point Force per unit charge of a point Electric field intensity Electric potential Work done per unit charge on a charge moved between two points in an electric field Potential gradient Equals charge in potential per unit distance and is also called the Static charge Always lies on the surfaces of a conductor Conductor Can have no potential difference between two on the surface of a blank. All points have equal potential Equi potential No work is done moving normal lines of force Sharpest curve Charges concentrate on the blank surfaces of nonspherical conductors Capacitors Conductive plates separated by an insulator, charge is stored on the plates Capacitance Ratio of charge on a capacitor plate to the potential difference between plates Parallel capacitors All caps have same potential difference since all opposite sides are connected Series capacitor All caps have same charge because opposite sides are connected within the circuit
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