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WorksheetsElectrostatics Summative Assessment
Total questions: 20
Worksheet time: 16mins
What happens if Jane rubs a piece of fur on a hard rubber rod, giving the rod a negative charge?
The fur is left neutral.
Electrons are added to the rod.
The fur is also charged negatively.
Protons are removed from the rod.
When two different materials touch each other directly, some of the electrons in one material is transferred into the other material, this effect can be increased by rubbing the two surfaces together. What charging process is involved?
conduction
earthing
friction
induction
Which activity does not produce the same results as the other three?
walking across a woolen carpet
brushing dry hair with a plastic comb
sliding over a plastic-covers automobile seat
scraping food from a metal bowl with a metal spoon
Which of the following describes on the two objects that are charge by rubbing them together?
Neither may be a conductor.
They must be made of different materials.
They will sometimes end up with both being positively charged.
The heat produced by friction is a necessary part of this process.
If body X, with a positive charge, is used to charge body Y by induction, what will be the nature of the charge left on the latter?
must be positive
must be negative
must be equal in magnitude to that on X
must be greater in magnitude than that on X
You wish to use a positively charged rod to charge a ball by induction. Which statement is TRUE?
The ball must be a conductor.
The charge on the ball will be positive.
The ball is charged as the area of contact between the two increases.
The ball must be an insulator that is connected temporarily to the ground.
Rubber is a non-conducting material that is why it cannot easily conduct heat and electricity. Which is the best explanation for this kind of material?
It has no electrons.
It has few electrons.
It has excess electrons which are loosely bounded with its nuclei so it can free to move.
It has deficiency in electrons which are tightly bounded with its nuclei so it cannot move freely.
How can a charged object attract an uncharged object made of non-conducting material?
Attraction of an insulator is not possible.
The uncharged object must somehow gain a like charge.
The charges in the uncharged object can become polarized.
The uncharged object must somehow gain an unlike charge.
When you rub a plastic rod against your skin, electrons will likely move ____________________.
from the rod to your skin
from your skin to the rod
simultaneously to your skin and the rod
cannot be determined
An uncharged conductor is supported by an insulating stand. I pass a positively charged rod near the left end of the conductor, but do not touch it. The right end of the conductor will be __________.
positive
neutral
negative
attracted
Which of the following provides a graphical representation of an electric field?
graph
field lines
parabola
x-y plane
Which of the following will likely happen to the electric field of the force of an isolated negative charge? It will move _______________.
parallel
perpendicular
radially inward
radially outward
Which of the following will likely occur to the electric field of the force of an isolated positive charge? It will move _______________.
parallel
perpendicular
radially inward
radially outward
Which of the following best describes electric field lines?
They exist physically.
They are close together where the electric field is weak.
They enter negative charges and leave positive charges.
They have the same pattern around regardless of the number of point charges.
The number of electric field lines passing through a cross sectional area indicates its _________.
charge density
charge motion
field direction
field strength
Q1 has 50 electric field lines radiating outward and Q2 has 100 field lines converging inward. What is the ratio Q1/Q2?
−2
−1/2
1/2
2
A charge, +Q, is placed inside a balloon and the balloon is inflated. What happens to the number of field lines going through the surface of the balloon as the radius of the balloon r increases?
stays the same
decreases as 1/r
increases proportional to r
increases proportional to r^2
A point charge is placed at the center of a spherical gaussian surface. Which of the following will make the electric flux changed?
If the point charge is moved outside the sphere
If a second point charge is placed outside the sphere
If the sphere is replaced by a cube of the same volume
If the point charge is moved to its position but still inside the sphere
A closed surface contains the following point charges: 6 C, 4 C, –2 C, –4 C. What is the electric flux coming out of the surface?
–16 C/εo
–4 C/εo
4 C/εo
16 C/εo
Which of the following best describes Gauss’s law?
A law that describes what a magnetic field will look like due to a known distribution of charge.
A law that describes what an electric field will look like due to a known distribution of charge.
A law that describes what a magnetic field will look like due to an unknown distribution of charge.
A law that describes what an electric field will look like due to an unknown distribution of charge.
