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Unit 11 Review: Electrostatics3176270304228500What is the formula for Coulomb’s Law?Manipulate the formula to solve for each of the following variables (Q1, Q2 and d).Q1 = F?d2/k?Q2 Q2 = F?d2/k?Q1d =√ k?Q1?Q2/FOne positive 4.0C charge and one negative -4.0C charge are separated by 10m. What is the force between the two charges? (Answer in sig figs and with correct units)(-)1 X 109 (attractive) Answer will be negative because of negative charge, this means that the forces are attractive because opposite charges attractTwo negative charges of -5.0 X 10-5C repel each other with a force of 20N. What is the distance between the two charges? (Answer in sig figs and with correct units)1mAccording to Coulomb’s Law, what will happen to the electrical force between two objects if the distance between them is doubled? Halved?Force is cut in half, force is doubledAccording to Coulomb’s Law, what will happen to the electrical force between two objects if one or both charges are doubled? Halved?One charge doubled = doubled, two charges doubled = quadrupled, one charged halved = halved, two charges halved = quarteredWrite a statement describing the relationship between electrical force and the distance between two objects.As distance increases, electrical force decreases and vice versa.Who invented lightning rods?Benjamin FranklinDescribe the following:Charging by induction – charging of an object without it actually touching another charged objectCharging by conduction – contact of a charged object to a neutral objectCharging by friction – occurs when two objects are rubbed together (ex. balloon and wool)Describe the flow of electrons in both a conductor and an insulator.Conductor – electrons flow freely; insulator – electrons do not flow freelyDefine capacitance.The ability of a conductor to store energy in the form of electrically separated chargesWhat does the law of conservation of charge state?Total amount of charge of objects is same before and after any type of charging process.Read and review information about a Van de Graaff generator from your lab sheet and notes. Write important notes about it here:Large conducting sphere that acquires electrons from rotating belt or motor; invented by Robert Van de Graaff in 1931; there are two types – high voltage power supply and belts and rollers; used to create static electricity and make it available for experimentationDefine electrical potential energy.Potential energy associated with an object due to its position relative to a source of electric force.How do charges move through electric field lines?From positive charge toward negative chargeFill in each blank with the words repel or attractPositive plus positive - repelNegative plus negative - repelNegative plus positive - attractNegative plus neutral - attractPositive plus neutral - attractWhat occurs when electrical charges are polarized?Positive and negative charges and separatedDescribe each of the following subatomic particles. Include where they are located, charge and size information: Proton – nucleus, positive, massive (compared to electron) Neutron – nucleus, neutral (no charge), massive (compared to electron)Electron – outside nucleus, negative, significantly smaller than protons and neutronsTrue or false – Newton’s 2nd Law states that for every action there is an equal and opposite reaction. This applies to the attractive and repulsive forces of electrical charges. (If the statement is false, change it to make it true.)False – should say 3rd lawWho introduced the concept of the electric field?Michael FaradayWhat happens in clouds before lightning occurs?Polarization of charges (charges separate); + charges at top of cloud, - charges at bottom of cloudHow do dryer sheets work?Dryer sheets have a positive charge, so they equalize the negative charge of electrons to prevent static clingWater is polar. What does this mean? Oxygen end of water molecule is negative and hydrogen end of water molecule is positiveWhat is the difference between a vector and scalar quantity?Vector – magnitude and directionScalar – magnitude only ................
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