Physics Principles and Problems 2009

Section 21.1 : Creating and Measuring Electric Fields

Self-Check Quizzes

1
An electric field produces forces that can _____.
A)lift objects
B)create energy
C)do work
D)run an engine
2
What is true about the directions of the force on a positive test charge and the electric field?
A)They depend on the distance between two objects.
B)They are in the opposite directions.
C)They cannot be accurately determined.
D)They are in the same direction.
3
A test charge is used to _____ an electric field.
A)create
B)change
C)measure
D)destroy
4
Which is not true about electric field lines?
A)They do not really exist.
B)They can cross each other if more than one field is present.
C)They extend in three dimensions.
D)The space between the lines gives useful information.
5
What are electric field lines used for?
A)to calculate the force on a charged body
B)to find the direction of a current in space
C)to explain why charged bodies exert a force on each other
D)to determine the strength of an electric field
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