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Physics 14.3 Review Questions
Terms in this set (18)
What is meant by the expression "action at a distance"?
the interaction of things are physically far apart
How does the concept of a field eliminate the idea of "at a distance"?
there is actual contact between the object and the field
How are a gravitational and an electric field similar?
They both a result of exerting forces
How is an electric field different from a gravitational field?
an electric field acts on a charge instead of a mass and it can both attract and repel.
Gravitational fields act upon mass and can only attract
Why is an electric field considered a vector quantity?
it has both magnitude and direction
What are electric field lines?
lines depicting the strength and direction of an electric field
How do their directions compare with the direction of the force that acts on a positive test charge in the same region?
How is the strength of an electric field indicated with field lines?
the closer the lines = the stronger the field
the longer the line = the stronger the field
How do the electric field lines appear when the field has the same strength at all points in a region?
The lines appear parallel and equally spaced
Why are occupants inside a car struck by lightning safe?
the car is a conductor, so the charge will move along the outside of the car and the internal charge cancels to zero
What is the size of the electric field inside any charged conductor?
zero - cancels
Can gravity be shielded?
No it can only attract
Can electric fields be shielded?
Yes because they can attract and repel
The vectors for the gravitational field of the earth point toward the earth; the vectors for the electric field of a proton point away from the proton. Why?
field lines show force direction on a positive test charge, which indicates that the earth is negative since protons are positive
Imagine a "free" electron and "free" proton held midway between the plates of a charged parallel plate capacitor. A) When released, how do their accelerations and directions of travel compare? B) If we ignore their attraction to each other, which reaches a capacitor plate first?
The electron accelerates more because it has less mass being acted on by the same force.
The proton and electron will move in opposite directions with the electron reaching the capacitor first
The strength of the electric field about an isolated point charge has a certain value at a distance of 1 m. A) How will the electric field strength compare at a distance of 2 m from the point charge? B) What law guides your answer?
inverse square law
When a conductor is charged, the charge moves to the outer surface of the conductor. Why is this so?
the charge has mutual repulsions and spreads out as far as possible to repel
Suppose that a metal file cabinet is charged. How will the charge concentration at the corners of the cabinet compare with the charge concentration on the flat parts of the cabinet? Defend your answer.
charge will be greatest at the corners because mutual repulsions push charge to the largest distance
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