5. a. A student did their laundry and four (4) objects became charged after a trip through the dryer, A shirt attracts some underwear but repels a sock; the sock attracts a pair of nylons; and we know the nylons have a negative charge. What is the charge on the underwear? How do you know? b. Why do clothes often come out of the dryer with excess charge? 6. Next to the description place the letter of the diagram that best represents the charge and its position on an electroscope during each of the procedures describes. + + + + + + A B C D E I. A positvely charged rod is brought near the top of an uncharged electroscope but does not touch the electroscope. II. A glass rod is charged positively by rubbing it with silk. The silk is then touched to the top of a neutral electroscope. III. A positively charged rod is brought near a neutral electroscope, and the electroscope is charged by induction. IV. An electroscope is charged by conduction/contact using a positively charged rod. V. A negatively charged rod is brought near a neutral electroscope but does not touch it. VI. A positively charged rod is brought near a positively charged electroscope. VII. A metal rod is brought in contact with the positively charged electroscope. What is special about metal?7. a. What is the equation for Electric Field? b. What is the equation for Electric Force? 8. If there are 10 joules of electric potential energy needed to push 1 coulomb of charge against an electric field, what will be its voltage/electric potential with respect to its starting position? 9. A 2 coulomb charge is moved in an electric field from a voltage of 2 V to one of 10V. How much electric potential energy does the charge have at each of the voltages? 10. At a particular point near a second charge, a 50 microcoulomb charge experiences a force of 2.0 N. What is the electrical field strength at that point? (Hint: 1 microcoulomb = 1 x 10 - C) 1 1. In a hydrogen atom, the proton and the electron (q=1.6 x 10 -" C) are separated by an average distance of 5 x 10 -" m. a)What is the electric force between the proton and electron? b) What is the electric field of the proton at the distance of the electron? 12. Draw the Electric Field Lines and Equipotential lines Draw the Electric Field Lines and Equipotential lines for charged parallel plates: or a point charge: Draw the Electric Field Lines and Equipotential lines for a charged pair