Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
Physics 4th quarter
Exam review
| Question | Answer |
|---|---|
| What happens when a rubber rod is rubbed with a piece of fur, giving it a negative charge? | Electrons are added to the rod |
| A repelling force occurs between two charged objects when the charges are of | like signs |
| An attracting force occurs between two charged objects when the charges are of | unlike signs |
| When a glass rod is ruvved with silk and becomes positively charged, | electrons are removed from the rod |
| Electric charge is | conserved |
| If a positively charged glass rod is used to charge a metal bar by induction, the charge on the bar | must be positive |
| Charge is most easily transferred in | conductors |
| Which sentence best describes electrical conductors? | Electrical conductors have electric charges that move freely. |
| Which statement is the most correct regarding electric insulators? | charges within electric insulators do not readily move. |
| The process of charging a conductor by bringing it near another charged object and then grounding the conductor is called | induction |
| The figure shown above demonstrates charging by | polarization |
| both insulators and conductors can be charged by | contact |
| A surface charge can be produced on insulators by | induction |
| Conductors can be charged by ___, while insulators cannot. | contact |
| When charged body is brought close to an uncharged body without touching it, a __ charge may result on the uncharged body. When a charged body is brought into contact with an uncharged body and then is removed, a __ charge may result on the uncharged body | induced; residual |
| which of the following is not true for both gravitational and electric forces | forces are either attractive or repulsive |
| Two point charges, initially 2cm apart, are moved to a distance of 10cm apart. By what factor does the resulting electric force between them change?? | 1/25 |
| If the charge is tripled for two identical charges maintained at a constant separation, the electric force between them will be changed by what factor? | 9 |
| Two point charges, initially 1cm apart, are moved to a distance of 3cm apart. By what factor do the resulting electric and gravitational forces between them change? | 9 |
| Two positive charges, each of magnitude q, are on the y-axis at points y=+a and y=-a. Where would a third positive charge of the same magnitude be located for the net force on the third charge to be zero? | at the origin |
| Which is the most correct statement regarding the drawing of electric field lines? | Electric field lines can start on a charge of either polarity. |
| The relative distribution of charge density on the surface of a conducting solid depends upon which of the following? | the shape of the conductor |
| Where is the electric field of an isolated, uniformly charged, hollow metallic sphere greatest? | at the sphere's outer surface |
| A conductor that is in electrostatic equilibrium has an electric field inside the conductor that | is zero |
| The electric field just outside of a charged conductor in electrostatic equilibrium is | perpendicular to the conductor's surface. |
| For a conductor that is in electrostatic equilibrium, any excess charge | resides entirely on the conductor's outer surface |
| If an irregularly shaped conductor is in electrostatic equilibrium, charge accumulates | where the radius of curvature is smallest |
| Electric field strength depends on | charge and distance |
| What occurs when two charges are moved closer together? | the force between the charges increases |
| Resultant force on a charge is the ___ sum of the individual forces on that charge. | vector |
| Which of the following is not a characteristic of electrical potential energy? | it results from a single charge. |
| When a positive charge moves in the direction of the electric field, what happens to the electrical potential energy associated with the charge? | it decreases |
| Two positive point charges are initially separated by a distance of 2cm. If their separation is increased to 6cm, the resultant electrical potential energy is equal to what factor multiplied by the initial electrical potential energy? | 1/9 |
| Charge buildup between the plates of a capacitor stops when | the potential difference between the plates is equal to the applied potential difference. |
| When comparing the net charge of a charged capacitor with the net charge of the same capacitor when it is uncharged, the net charge is | equal in both capacitors |
| When a capacitor discharges, | charges move through the circuit from one plate to the other until both plates are uncharged |
| A capacitor consists of two metal plates; ___ is stored on one plate, and ___ is stored on the other. | negative charge, positive charge |
| What effect will be produced on a capacitor if the separation between the plates is increased? | it will decrease the capacitance |
| Increasing the potential difference between the plates of a capacitor will produce what effect on the capacitor? | It will decrease the charge on each plate. |
| A 0.25uF capacitor is connected to a 9.0 V battery. What is the charge on the capacitor? | 2.2 x 10^-6 |
| A parallel plate capacitor has a capacitance of C F. If the area of the plates is doubled while the distance between the plates is halved, the new capacitance will be | 4C |
| How is current affected if the number of charge carriers decreases? | The current decreases |
| How is current affected if the time interval over which the charge passes through a given area decreases while the amount of charge remains the same? | The current increases |
| The current in an electron beam in a cathode-ray tube is 7.0 x 10^-5 A. How much charge hits the screen in 5 seconds? | 3.5 x 10^-4 C |
Created by:
samanthamneff