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Stack #4728558
| Question | Answer |
|---|---|
| Laws: | "Certain concise but general statements about how nature behaves – Energy & momentum conservations, charge conservation, etc – A statement must be found experimentally valid to become a law" |
| Remember, gravitational force is only = | attractive |
| law of conservation of electric charge = The NET amount of electric charge produced in any process is | ZERO!! |
| * Electric forces are created by = | the electric charge |
| "Electric charge is --------------------- | conserved and quantized |
| "Protons and neutrons bound by a strong force create a -" | Positively charged nucleus |
| Negatively charged electrons are bound to the ---- | nucleus via electrical attraction |
| What is the net electric charge of an atom? | 0C |
| Conductors : | The electric current flows freely (loosely bound valence electrons |
| Insulators : | Current does NOT flow readily (tightly bound valence electrons |
| Semi-conductors: | Number of “free” valence electrons is controlled. (some parts insulate) (other parts conduct) |
| Static Electricity | - Rubbing two neutral objects together can displace electrons from one to the other. - These charges will be equal in magnitude and opposite in sign. - If given a path, the charges will readily flow together and neutralize each other. |
| Electromagnetic forces are - | much stronger than gravity and can be either attractive or repulsive |
| Coulomb’s law only finds the - | magnitude of the force |
| objects create - | fields, and these fields act upon other objects to create forces acting on them. |
| a vector (magnitude and direction) field is- | a collection of an infinite number of vectors, with a distinct vector at each point in space. |
| E points in the same direction as the force felt by a - | positive test charge |
| in static equilibrium… 1) Inside a conductor, | E=0. |
| Flux is a - | quantification of the effect of the field strength on a given surface area! |
| Permittivity = | - a measure of the opposition against the formation of the E field; - the ability to store electric potential energy |
| The surface is symmetric about the charge. – What does this tell us about the field E? | - Must have the same magnitude (uniform) at any point on the surface |
| What is Gauss’ Law good for? Can be used to obtain - | electric field, forces or charges |
| Gauss’ Law: Any differences between the input and output flux of the electric field over any enclosed surface is due to the - | charge inside that surface!!! |
| E0 is the - | permittivity of free space in the Coulomb’s law |
| The charge outside the surface does not contribute to Qencl. Why? | The charge outside the surface might impact field lines but not the total number of lines entering or leaving the surface |
| Electric charge (two types (Positive and negative) is a property of = | subatomic particles. |
| *Solids* Positively charged nuclei and inner (core) electrons are bound - while outer (valence) electrons ---- | tightly in place while arent bound as tightly |
| *Solids* A material’s electrical properties are determined by the strength of the _____________ | valence electron bonds |
| Electric charges neutralize each other, gravity - | dominates |
| *Electric Field Lines* The number of lines starting on a positive charge (or ending on a negative charge) is ----- | proportional to the charge. |
| Electric Field Lines* The closer the lines _________ | the stronger the field. |
| A material without an electric field inside in static electrictiy = | Conductor of Electricity |
| What direction does the electric field go to? | Directs into the negative charge |
| Electric field can penetrate an - | insulator |
| • 7. A circular ring of radius and a charge Q evenly distributed on it lies in the x-y plane with its center at the origin. A small positive test charge q is placed at the origin in the x-y plane. What is the direction of force on q, if Q is negative? | No direction since the force is zero. |
| 8. A proton and an electron are separated by the distance of 1fm (femto-meter). What is the direction of the force the proton exerts on the electron? | a. toward the proton |
| 11. If a charge is located at the center of a hollow spherical volume and the electric flux through the surface of the sphere is o, what X is the flux through the half the surface of sphere if the radius of the sphere quadruples? | 0.5 Ф • Radius Change: When the radius quadruples, the total flux remains exactly the same • Half the Surface: Because the charge is located at the exact center, half it! |
Created by:
Alynna