| Question | Answer |
| What are electric field lines? | Easier ways to show vector quantities, farther apart lines are, weaker the field |
| Strength of an electric field = | Force exerted / Test charge |
| What is the equation for calculating the magnitude of an electric field? | E = F/q |
| What direction would a positive field be? | Away |
| What direction would a negative field be? | Towards |
| How do you measure direction of an electric field? | Direction on small positive test charge? |
| How do you measure magnitude in an electric field? | Effects on small positive test charges in the field |
| Electric fields vector quantities | Both magnitude and direction |
| Electric field | Force field that surrounds charge. "Action at a distance" |
| How do insulators charge by induction? | Realignment of charge rather than migration. Tiny bits of paper. |
| 3 ways to charge and object | 1. Friction. 2. Conduction. 3. Induction. |
| Electric dipoles | Electrically polarized molecules in normal state |
| Electronic Polarization | Rearrangement of positions of charges withing atoms caused by induction |
| How do lightening rods work | Ions flow to the pointed rod above a building. Rod collects electrons from the clouds and a "sink," and prevents induction from lightening. It is also the hope that if lightening does occur, it will strike the lightening rod and be short-circuited to the ground, instead of hitting the building |
| Why do lightening rods work? | Charge flows readily to or from sharp points, and height helps. |
| Why does lightening happen? | Negative clouds and positive earth. Electrons sometimes jump from cloud to earth causing a lightening bolt |
| How do thunderstorms become negatively charged? | Friction |
| Grounding | Allow charge to move off of(or onto) conductor by touching it |
| Charging by induction | Charged object near conducting surface |
| Charging by conduct | Charged rod touches neutral objects, electrons flow to the neutral object, charging it |
| Charging by friction | One material rubs against another and literally scrapes electrons off |
| Superconductors | When temperatures approach absolute zero, some metals have infinite conductibility. We don't know why. |
| Semiconductors | Behave sometimes as insulators, sometimes as conductors |
| Why do conductors conduct electricity well? | They have loose out electron shells |
| insulators | do not conduct electricity |
| conductors | readily conduct electricity |
| Coulomb | Unit of charge, "C" 1 C = charge through common 100-W light bulb in 1 second |
| Coulomb's Law | F = kq1q2/d^2 |
| conservation of charge | charge can never be created or destroyed |
| ion | charged atom |
| Fundamental rule of all electrical phenomena | like charges repel; opposite charges attract |
| charge | an attracting or repelling behavior |
| electrostatics | electricity at rest |
33 cards - created mar 24, 10:24pm