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unit 7 physics
| Question | Answer |
|---|---|
| What is the principle reservoir for excess electric charge? | the earth |
| Regarding the movement of an electric charge from one atom to another atom: | Usually outer-shell electrons move |
| Electric energy can be converted into: | Thermal energy by a lamp |
| Electrostatics concerns | concerns resting electric charges |
| Coulombs law states that electrostatic force is: | inversely proportional to the square of the distance between charges |
| Which of the following is a method of electrification? | induction |
| Static electricity can do what | can make one's hair stand on end |
| The unit of electrostatic charge is the | Coulomb |
| The principle electrostatic law states that | an electron will repel an electron |
| Objects become electrified because of | the transfer of electrons |
| The phenomenon of lightning occurs when | one cloud is positively electrified and an adjacent one is negatively electrified |
| Which of the following would be included as one of the four basic electrostatic laws? | Electric charge concentration |
| An electrostatic force is created when a/an | proton approaches a proton |
| A radiographic tube is operated at 500 mA. How many electrons per second is this? | 3.2 x 10^18 |
| The unit of electrostatic force is the | newton |
| Which of the following are not affected by electrostatically charged matter? | x-rays |
| How many electrons are contained in 0.5 µC? | 3.2 x 10^12 |
| When a copper conductor becomes electrified: | A kink in the wire will have higher surface electrification &&& Negative charges concentrate on the surface and positive charges are ditributed without |
| The unit of electric potential is the | Volt |
| Two positive 0.5 C charges are positioned 1.0 m apart. The force acting betwenn them is: | Repulsive |
| Which of the following is the best electric static insulator? | Water |
| The ratio of the electic potentional across a circuit element to the current flowing through that element is called | Resistance |
| The electrical resistance of wire increases as the diameter of the | wire decreases |
| When an electric current flows through a wire with resistance(R) energy is | Generated as heat |
| When lelectrons move in a copper wire | Resistance to the electron flow exits |
| The number of volts required to cause a current of 40 A in a current having a resistance of 5 Ω is | 200 V |
| the unit of electric potential is the | Volt |
| Ohms law states that | The electric potentional is the product of current and resistance |
| The flow of 1 C/s in a conductor is equal to | 1 A |
| in a series circuit | The total resistance is the sum of the individual resistances |
| In electrodynamics, which of the following is correct expression? | V = IR |
| Which of the following is normally measured in volts? | Electric potential |
| Milliampere seconds (mAs) is a unit of | Electric current |
| Electric insulators: | Inhibit movement of electric charge |
| 1 A is equal to | 1 C/s |
| Battery symbol | c |
| capacitor symbol | d |
| resistor symbol | b |
| Switch symbol | e |
| transformer symbol | a |
| Allows electrons to flow in only one direction | a(know symbol) |
| Increases or decreases voltage | e(know symbol) |
| Inhibits the flow of electrons | d(know symbol) |
| measures electric current | c(know symbol) |
| Momentarily stores electric charge | b(know symbol) |
| Which of the following is a physical property that we cannot sense? | magnetism |
| An example of a magnetic domain is: | A nucleus |
| If a bar magnet were suspended in space and another bar of nonmagnetic material were brought close to it, what would happen? | Nothing |
| If two bar magnets suspended in space were brought together, what would happen? | They would rotate and attract |
| A lodestone is an example of: | A natural magnetic |
| Which of the following would likely be classified as ferromagnetic material? | Iron |
| If two magnets are brought together, north to north poles will______ whereas north to south poles will______> | repel; attract |
| Most magnets | are affected by another magnetic field |
| Most magnetic materials are | Still magnetic whem broken |
| A navigational compass: | Has both a north and a south pole |
| Which of the following is a classification of magnetism? | Paramagnetism |
| The earth's magnetic field is strongest: | at the poles |
| The physical laws of magnetism: | requires that there be a soith pole for every north pole |
| Which of the following can create a magnetic field? | A spinning proton |
| The force between the poles of the two bar magnets | obeys the inverse square law |
| When the iron is fabricated into a magnet, magnets domains | Align |
| Magnetism has some properties similiar to those of electrostatics, such as | both obey the inverse square law |
| magnetism: | is present in some naturally occuring ores |
| When a chaged particle moves in a straight line a magnetic field is | created perpendicular to the particle motion |
| Which of the following has an associated magnetic field | Hydrogen nucleus |
| When iron is brought near a permanent magnet the lines of the magnetic field are | atrracted to the iron |
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