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Name: ______________ Ch 17: Electric Potential Study Guide 1. The ____________ ____________, V at any point in space is the electric potential energy per unit charge. To calculate V the following formula may be used: 2. Electric potential difference is the work done to move 1 C electric charge between two points. It is measured in ________ and is sometimes called ____________. 3. Draw an electric dipole in the space provided. Be sure to indicate the charges and the direction of the electric field. 4. Perpendicular to the electric field, __________________ lines indicate where the potential is the same around a charge. Draw these around the charges in the drawing you made in question number 3 above. 5. A device used to store charge and electric energy is a _______________. It is made of two non-touching _______________ separated by an insulating material called a ______________. 6. Give at least two examples of the types of insulating materials that are used in these devices. 7. How many types of electric charges are there and how do these charges interact? Describe in words and/or drawings in the space provided below. 8. A conductor is a material that allows electric charge and heat to move relatively easily. Why is that? What is happening at the atomic level? (describe in words and/or drawings below) 9. What type of material(s) tends to be a good conductor? 10. Insulators are materials that do not freely allow charge to flow. Why is that? What is happening at the atomic level? (describe in words and/or drawings below) 11. What type of material(s) tends to be a good insulators? 12. There are three primary ways that objects can become charged. Describe each below. a. b. c. 13. The electric field intensity between two large, charged, parallel metal plates is 6000N/C and the plates are 0.05 m apart. What is the electric potential difference between them? 14. A voltmeter reads 400 V across two charged, parallel plates that are 0.020 m apart. What ist he electric field between them? 15. When a potential difference of 125 V is applied to two parallel plates, the field between them is 4.25 x 103 N/C. How far apart are the plates? 16. A 12-V car battery can store 1.44 x 106 C when it is fully charged. How much work can be done by this battery before it needs recharging? 17. An electron in a TV picture tube passes through a potential difference of 18,000 V. How much work is done on the electron as it passes through that potential difference? 18. The electric field in a particle-accelerator machine is 4.5 x 105 N/C. How much work is done to move a proton 25 cm through that field? 19. A 2.2 µF capacitor first is charged so that the electric potential differences is 6.0 V. How much additional charge is needed to increase the electric potential difference to 15.0 V? 20. When a charge of 2.5 X10-5 C is added to a capacitor the potential differences increases from 12.0 V to 14. 5 V. What is the capacitance of the capacitor? 21. How much charge is stored on a 4.7 µF capacitor when a potential difference of 12 V is applied to it?