Electricity Jeopardy Electrostatics Electric Fields and Potential Coulomb ’ s Law Extra problems and comparing F e and F g Extra Q $100 Q $200 Q $300 Q $400 Q $500 Q $100 Q $200 Q $300 Q $400 Q $500 Final Jeopardy

$100 Electrostatics How can you create a positive charge?

$100 Answer Electrostatics Take away the electrons so only the protons are left behind.

$200 Electrostatics What is the difference between a conductor and an insulator?

$200 Answer Electrostatics Conductors have “ free ” electrons but insulators have tightly bound electrons. This means that conductors allow electrons to move through them easily, insulators do not.

$300 Electrostatics When charges separate themselves due to charging by polarization, how does this happen?

$300 Answer Electrostatics A charged object is brought near an uncharged object

$400 Electrostatics What are the 3 ways to charge an object? Give an example of each one.

$400 Answer Electrostatics Friction Conduction Polarization

$500 Electrostatics What type of charging is occurring in a clothes dryer? Why do we use dryer sheets?

$500 Answer Electrostatics Friction and conduction. In the dryer the clothes rub together, transferring electrons. The dryer sheet is used to take away any extra charge.

$100 Question Electric Fields If you walk into a region of space and suddenly feel a force, the space is said to contain a ____________. a)Black hole b)Charged object c)Force field d)Heavy object e)Large charge

$100 Answer Electric Fields c) Force field

$200 Question Electric Fields If this were a hollow object with a build up of negative charge, draw how the charge would distribute it self inside and explain what you draw.

$200 Answer Electric Fields Charges spread out and bunch up at the corners.

$300 Question Electric Fields Draw the electric field lines between a positive and a negative charge.

$300 Answer Electric Fields and Potential

$400 Question Electric Fields and Potential Draw a diagram of the electric field lines between two similar positive charges.

$400 Answer Electric Fields and Potential

$500 Question Electric Fields and Potential Why are you safe in a lighting storm If you are sitting in your car?

$500 Answer Electric Fields and Potential The car acts like a faraday cage. All of the charge gathers on the outside of the car keeping you safe.

$100 Question Coulomb Which tends to be a stronger force, gravitational force or electrostatic force?

$100 Answer Coulomb Electrostatic Force

$200 Question Coulomb If you quadruple the distance between two charges, what happens to the electrostatic force?

$200 Answer Coulomb The force decreases… Specifically, Reduced by a factor of 16

$300 Question Coulomb What will happen to the force between two charges if the distance remains the same, but the amount of charge increases?

$300 Answer Coulomb The overall force will increase

$400 Question Coulomb What is the electrostatic force between two negative charges of C separated by a distance of 5 meters? Is it attractive or repulsive?

$400 Answer Coulomb 3.5 x 10 6 N repulsive force

$500 Question Coulomb What is the electrostatic force between a proton and an electron separated by a distance of 7 x N?

$500 Answer Coulomb 4.7 x N

$100 Question Extra What are the charged parts of the atom?

$100 Answer Extra Electrons and protons

$200 Question Extra What does the symbol q represent in Coulomb’s Law equation? What are the units for q?

$200 Answer Extra q represents Charge of an object C (coulomb’s) are the unit of charge

$300 Question Extra What does the symbol k represent?

$300 Answer Extra k represents a constant k = 9 x 10 9

$400 Question Extra Why did the pieces of paper fly off of the Van der Graaff Generator?

$400 Answer Extra They were being repelled. The charges were similar.

$500 Question Extra Create an example problem.

$500 Answer Extra

$100 Question Extra Why will your hair stand up when you hold onto the Van de Graff generator.

$100 Answer Extra Electrons build up even in your hair and the electrons repel each other.

$200 Question Extra What type of charging causes the plastic on a CD to stick to you when you first unwrap the CD?

$200 Answer Extra Friction

$300 Question Extra A positive object ____________ (gains/loses) electrons.

$300 Answer Extra Loses

$400 Question Extra Why shouldn ’ t you get in and out of your car when you pump gas?

$400 Answer Extra You can charge yourself by friction when you slide in and out and then arc to the gas when you go to take the pump out of the tank. FIRE!

$500 Question Extra Why doesn ’ t it hurt you to have static charge built up on you? What actually hurts you when you get electrocuted?

$500 Answer Extra The transfer of electrons is what hurts you

Final Jeopardy A 3kg sphere with a charge of +3 x C is placed 0.7m from a 5kg sphere with a charge of +4 x C. Calculate all the forces (this means electric force and gravitational force) present and draw a force diagram of the forces. Which force is bigger?

Final Jeopardy Answer F e = 2.2 N F g = 2.04x10 -9 N F e is much greater