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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

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$100 Electrostatics How can you create a positive ion of hydrogen?

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$100 Answer Electrostatics Take away the electron so only the proton is left behind.

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

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$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.

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$300 Electrostatics When charges separate themselves due to charging by induction, this is called what?

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$300 Answer Electrostatics Polarization.

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

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$400 Answer Electrostatics Friction Conduction Induction

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$500 Electrostatics What type of charging is occurring when a balloon sticks to a wall? What is actually happening between the balloon and the wall?

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$500 Answer Electrostatics Induction: The negatively charged balloon will not transfer charge since it is an insulator, instead, it induces an electric dipole in the wall with the positive charges closer to the outside and the negatives pushed further away from the balloon.

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$100 Question Electric Fields and Potential 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

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$100 Answer Electric Fields and Potential c) Force field

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$200 Question Electric Fields and Potential 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.

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$200 Answer Electric Fields and Potential Charges bunch up at the corners in order to make the net force in the center equal to zero

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

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$300 Answer Electric Fields and Potential

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

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$400 Answer Electric Fields and Potential

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

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$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.

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

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$100 Answer Coulomb Electrostatic Force

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

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$200 Answer Coulomb Reduced by a factor of 16

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$300 Question Coulomb What will the force of between two charges be if they start off with a force of 15 N, but you double one of the charges and you double the distance?

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$300 Answer Coulomb 7.5 N

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$400 Question Coulomb What is the electrostatic force between two negative charges of 0.098 C separated by a distance of 5 meters? Is it attractive or repulsive?

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$400 Answer Coulomb 3.5 x 10 6 N repulsive force

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$500 Question Coulomb What is the electrostatic force between a proton and an electron separated by a distance of 7 x 10 -8 N?

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$500 Answer Coulomb 4.7 x 10 -14 N

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$100 Question Extra Compare the relative strength of gravitational force to electrostatic force force.

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$100 Answer Extra Electrostatic is much stronger

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$200 Question Extra Compare the gravitational force and electro static force between a proton and a neutron if they are 5x10 -11 m from each other. The mass of a proton is 1.6x10 -27 kg and the mass of a neutron is 1.6x10 -27 kg. Remember the elementary unit of charge is 1.6x10 -19 C

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$200 Answer Extra There is no electrostatic force F g = 6.8x10 -44 N

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$300 Question Extra Which particle feels a stronger electric field?

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$300 Answer Extra They feel the same strength

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$400 Question Extra Compare the strength of the gravitational force and the electrostatic force of a proton and an electron if they sit 5x10 -11 m away from each other and the electron has a mass of 9x10 -31 kg and a proton has a mass of 1.6x10 -27 kg.

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$400 Answer Extra F g = 3.8x10 -47 N F e = 9.2x10 -8 N (Much stronger!)

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$500 Question Extra Name the 4 fundamental forces in the universe.

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$500 Answer Extra Gravity Weak Nuclear Force Electromagnetic Force Strong Nuclear Force

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

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

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

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$200 Answer Extra Friction

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$300 Question Extra A positive Ion ____________ electrons.

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$300 Answer Extra Loses

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

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$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!

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$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?

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$500 Answer Extra Current is what hurts you

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Final Jeopardy A 3kg sphere with a charge of +3 x 10 -4 C is placed 0.7m from a 5kg sphere with a charge of +4 x 10 -7 C. Calculate all the forces present and draw a force diagram of the forces. Which force is bigger?

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

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