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22 Cards in this Set
- Front
- Back
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One of the following is not true of a conductor in electrostatic equilibrium.
a) Any excess charge in an isolated conductor resides entirely on its surface.
b) The electric field is zero everywhere outside the conductor.
c) The field just outside a charged conductor is perpendicular to the conductor's surface.
d) On an irregularly shaped conductor, the charge per unit area is greatest at locations where the radius of curvature of the surface is smallest. |
a) Any excess charge in an isolated conductor resides entirely on its surface. |
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If the signs of the charges on two objects are both reversed, what happens to the electric force between them?
A) Reversed B) Same C) Zero D) Can't tell |
B) Same |
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Why are electrostatic experiments difficult to perform on humid days?
A) No charges are developed on humid days B) One feels sleepy and unable to notice the charges as they are formed. C) The humidity is too high D) Water is a good conductor of electricity |
D) Water is a good conductor of electricity |
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One of the following is not a conductor of electricity:
A) Glass rod B) Aluminum rod C) Copper rod D) Iron rod |
A) Glass rod |
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The law that gives the quantitative measure of the force between charged particles is called _______ law.
A) Coulomb's B) Gauss's C) Faraday's D) Newton's |
A) Coulomb's |
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If the distance between two charges is cut in half, what happens to the electric force between them?
A) Quadrupled B) Doubled C) Halved D) Quartered |
A) Quadrupled |
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An ebonite rod rubbed with fur becomes _______ charged, while the fur becomes _______ charged.
A) Negatively, positively B) Positively, positively C) Positively, neutrally D) Negatively, neutrally E) Negatively, negatively |
A) Negatively, positively |
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When defining the electric field, why is it necessary to specify that the magnitude of the test charge be very small?
A) Because a big test charge does not have a uniform electric field. B) Because a small test charge has no electric field C) Because the electric field of a big test charge will distort the electric field to be measured. D) Because a small teat charge has no mass. |
C) Because the electric field of a big test charge will distort the electric field to be measured. |
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If the total charge inside a closed surface is known but the distribution of charge is unspecified, can you use Gauss's law to find the electric field?
A) No B) Yes |
A) No |
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An electroscope is charged by induction using a rubber rod that has been rubbed with fur. What is the charge on the leaves of the electrocrope?
A) Can't tell? B) Negative C) Positive D) It is not charged. |
C) Positive |
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Is it possible for an electric field to exist in empty space?
A) Yes B) No |
A) Yes |
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A charged comb will often attract small bits of dry paper that then _________ when they touch the comb.
A) Can't tell B) Remain stuck to the comb C) fly away |
C) fly away |
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The electric potential of a proton released from rest in a uniform electric field will:
A) Can't tell B) Increase C) Decrease D) Remain the Same |
C) Decrease |
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The kinetic energy of an electron released from rest in a uniform electric field will:
A) Remain the Same B) Can't tell C) Increase D) Decrease |
C) Increase |
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Describe the direction of electric field vector on an equipotential surface:
A) Can't tell B) Field lines are parallel to the surface C) Field lines are normal to the surface D) Field lines make a non-zero angle with the surface |
C) Field lines are normal to the surface |
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How would you connect capacitors in order for the equivalent capacitance to be greater than the smallest but less than the biggest capacitor in the combination?
A) In Parallel B) It is not possible C) At random D) In series |
B) It is not possible |
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What is the net charge on a capacitor?
A) Can't tell, it depends on the charge and size on each plate. B) The charge on each plate C) Zero D) Twice the charge on each plate |
C) Zero |
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If a metal receives a negative charge, does its mass increase, decrease or stay the same?
A) Stays the same B) Can't tell C) Decrease D) Increase
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D) Increase |
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The dielectric constant of a conductor is _________
A) Between zero and infinity B) Zero C) Infinite D) Can't Tell |
C) Infinite |
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The electric field on the surface of a conductor in electrostatic equilibrium is zero, can you conclude that the potential is also zero?
A) Yes B) No |
B) No |
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If the electric field in a region of space is zero, can you conclude there are no electric charges in that region?
A) Yes B) No C) Can't tell |
A) Yes |
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Are occupants of a steel-frame building safer than those in a wood-frame house during an electrical storm?
A) They are equally safe B) Yes C) No D) Can't tell |
B) Yes |
