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Electrostatics Review What is the charge of one electron? Answer: • -1.6E-19 C Coulomb’s law says that the force between any two charges depends on what? Answer: • The sizes of the charges and inversely on the square of the distance between the charges • F = kqq/d2 Two charges are separated by a certain distance. If the magnitude of each charge is doubled, the force on each charge is….. Answer: • quadrupled When the distance between two charges is halved, the electrical force between the charges…. Answer: • Quadruples What does electrical forces have that gravitational forces do not? Answer: • Repulsive interactions What are charges doing in a conductor and insulator? Answer: Conductor – Moving freely • Insulator – Not moving at all What are semiconductors? Answer: • Can be insulators • Can be conductors • Have impurities to change their electrical properties How do you charge by induction? Answer: • Have a charged rod opposite the charge you want the object to be-bring it close to the object. • Ground the object • The object is now charged A charged balloon will stick to a neutral wall, which demonstrates charge…. Answer: • Polarization Two charged particles held close to each other are released. As the particles move, the velocity of each increases. Therefore, the particles have what kind of charges? Answer: • Can not determine them If the acceleration between two charged particles decreases, the particles have what kind of charges? Answer: • The same When comparing gravitational fields with electric fields, the magnitude of g is most like what in the electrical field? Answer: • The strength of the electric field What will happen to the electrical potential energy of a charged particle in an electric field when the particle is released? Answer: • Energy is transformed into KE When work is done to move two like charges close together, that work is the what in the system? Answer: • Electric Potential