Chapter+15+Electric+forces

Chapter 15 Electric Forces  JAKE BAILEY  __Vocabulary-__
 * Electric Charges (positive and negative)
 * Unlike charges attract; like charges repel
 * Always conserved
 * Force between two charged particles is proportional to the inverse square of the distance between them
 * Conductors-materials in which charges move freely in response to an electric field
 * Insulators-materials in which charges don't move much
 * Coulomb-SI unit of charge
 * Coulomb's Law-states that the electric force between two stationary charged particles separated by a distance //r// has the magnitude where q1 and q2 are the magnitudes of the charges on the particles in coulombs and is the Coulomb Constant
 * Direction of electric field-the direction of the electric force that would be exerted on a small positive charge placed at that point
 * Electric field lines-useful for visualizing the electric field in any region of space


 * Conductors in electrostatic
 * The electric field is zero everywhere inside the conducting material
 * Any excess charge on an isolated conductor must reside entirely on its surface
 * The electric field just outside a charged conductor is perpendicular to the conductor's surface
 * On an irregularly shaped conductor, charge accumulates where the radius of curvature of the surface is smallest, at sharp points
 * Gauss's Law-states that the electric flux through any closed surface is equal to the net charge //Q// inside the surface divided by the permittivity of free space

__Equations and Constants-__

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Multiple Choice Questions 1) How many lines would there be and what direction would they be going in two equally charged postive particles? A) Equal amount of lines and going toward each other B) Different amount of lines and going toward each other C) Equal amount of lines and going away from each other D) Different amount of lines and going away from each other

2) What happens when a charged insulator is placed near an uncharged metallic object? A) They repel each other B) They attract each other C) They may attract or repel each other, depending on whether the charge on the insulator is positive or negative D) They exert no electrostatic force on each other

3) What prevents gravity from pulling you through the ground to the center of the Earth? A) Electrons on the ground's surface and the surface of your feet repel one another <span style="color: #0000ff; font-family: Georgia,serif;">B) The density of matter is too great <span style="color: #0000ff; font-family: Georgia,serif;">C) The density of the ground is greater than the density of your body <span style="color: #0000ff; font-family: Georgia,serif;">D) The positive nuclei of your body's atoms repel the positive nuclei of the atoms on the ground <span style="color: #0000ff; font-family: Georgia,serif;">E) Atoms are bound together by chemical bonds

<span style="color: #0000ff; font-family: Georgia,serif;">4) In an electric field line chart, how many lines would there be on a particle 3 times as strong as another? <span style="color: #0000ff; font-family: Georgia,serif;">A) 3 times as many <span style="color: #0000ff; font-family: Georgia,serif;">B) 1/3 <span style="color: #0000ff; font-family: Georgia,serif;">C) 9 times as many