Physics - Chapter 16

25 July 2022
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question
What happened when a rubber rod is rubbed with a piece of fur, giving it a negative charge? a) protons are removed from the rod b) electrons are added to the rod c) electrons are added to the fur d) the fur is left neutral
answer
b) electrons are added to the rod
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a repelling force occurs between two charged objects when the charges are of... a) unlike signs b) like signs c) equal magnitude d) unequal magnitude
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b) like signs
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An attracting force occurs between two charged objects when the charges are of... a. unlike signs b. like signs c. equal magnitude d. unequal magnitude
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a. unlike signs
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when a glass rod is rubbed wit silk and becomes positively charged, a. electrons are removed from the rod b. protons are removed from the silk c. protons are added to the silk d. the silk remains neutral
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a. electrons are removed from the rod
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Electric charge is... a. found only in a conductor b. conserved c. found only in insulators d. not conserved
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b. conserved
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If a positively charged glass rod is used to charge a metal bar by induction, the charge on the bar... a. will be equal in magnitude to the charge on the glass rod b. must be negative c. must be positive d. will be greater in magnitude that the charge on the glass rod
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b. negative
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Charge is most easily transferred in... a. nonconductors b. conductors c. semiconductors d. insulators
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b. conductors
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In the diagram above, the circles represent small balls that have electric charges. Ball 1 has a negative charge, ball 2 is repelled by ball 1. Next, you see the ball 2 repels ball 3 and that ball 3 attracts ball 4. What is the electric charge on ball 4? a. Ball 4 may have either a positive or negative charge b. ball 4 has a negative charge c. ball 4 has a positive charge d. it is not possible to determine the charge on ball 4
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c. ball 4 has a positive charge
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Which sentence best describes electrical conductors? a. electrical conductors have low mass density b. electrical conductors have high tensile strength c. electrical conductors have electric charges that move freely d. electrical conductors are poor heat conductors
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c. electrical conductors have electric charges that move freely
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Which statement is the most correct regarding electric insulators? a. charges within electric insulators do no readily move b. electric insulators have high tensile strength c. electric charges move freely in electric insulators d. electric insulators are good heat conductors
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a. charges within electric insulators do no readily move
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The process of charging a conductor by bringing it near another charged object and then grounding the conductor is called... A. Contact charging B. Induction C. Polarization D. Neutralization
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B. Induction
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The figure shown above demonstrates charging by... A. Grounding B. Induction C. Polarization D. Contact
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C. Polarization
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Both insulators and conductors can be charged by.... A. Grounding B. Induction C. Polarization D. Contact
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D. Contact
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Conductors can be charged by _________, while insulators cannot. A. Grounding B. Induction C. Polarization D. Contact
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B. Induction
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When a charged body is. Roughy close to an uncharged body without touching it, a(n) _____________ charge may result on the uncharged body. When a charged body is brought into contact with an uncharged body and then is removed, a(n) _________ charge may result on the uncharged body. A. Negative; positive B. Positive; negative C. Induced; residual D. Residual; induced
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C. Induced; residual
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Which of the following is NOT true for both gravitational and electrical forces? A. The inverse square distance applies B. Forces are proportional to physical properties C. Potential energy is a function of distance of separation D. Forces are either attractive or repulsive
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D. Forces are either attractive or repulsive
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Two point charge, initially 2 cm apart, are moved to a distance of 10 cm apart. By what factor does the resulting electric force between them change? A. 25 B. 5 C. 1/5 D. 1/25
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D. 1/25
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If the charge is tripled for two identical charges maintained at a constant separation, the electric force between them will be charged by what factor? A. 1/0 B. 2/3 C. 9 D. 18
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C. 9
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Two positive charges, each of magnitude q, are on the y-axis at point 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? A. At the origin B. At y=2a C. At y=-2 D. At y=-a
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A. At the origin
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A conductor that is in electrostatic equilibrium has an electric field inside the conductor that.... A. Depends on the radius of the conductor B. Is zero C. Is greater near the conductors surface D. Is parallel to the surface of the conductor
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B. Is zero
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The electric field just outside a charged conductor in electrostatic equilibrium is.... A. Zero B. At it minimum level C. The same as it is in the center of each conductor D. Perpendicular to the conductors surface
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D. Perpendicular to the conductors surface
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For a conductor that is in electrostatic equilibrium, any excess charge... A. Follows to the ground B. Resides entirely on the conductors outer surface C. Resides entirely on the conductors interior surface D. Resides entirely in the center of the conductor
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B. Resides entirely on the conductors outer surface
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If an irregularly shaped conductor is in electrostatic equilibrium, charge accumulated.... A. Where the radius of curvature is smallest B. Where the radius of curvature is largest C. Evenly throughout the conductor D. In flat places
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A. Where the radius of curvature is smallest
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Electric field strength depends on... A. Charge and distance B. Charge and mass C. Coloumbs constant and mass D. Elementary charge and radius
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A. Charge and distance
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What occurs when two charges are moved closer together? A. The electric field doubles B. Coulomb's law takes effect C. The total charge increases D. The force between the charge increaes
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D. The forces between the charge increases
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Resultant force on a charge is the __________ sum of the individual forces on that charge. A. Scalar B. Vector C. Individual D. Negative
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B. Vector
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An object that has a negative electric charge has an abboundance of atomic particles called _______________
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Electrons
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When an object looses electrons it acquires a __________ electric charge
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Positive
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Materials, such as glass, in which electric charges do not move freely are called electrical ______________
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Insulators