Physics Principles and Problems 2009

Section 20.2 : Electric Force

Self-Check Quizzes

1
How can you determine if an electroscope is negatively or positively charged?
A)by adding negative charge
B)by touching a rod of known charge to the knob
C)by adding positive charge
D)by applying an electrical current to it
2
Lightening is a result of _____.
A)charge separation
B)charging by induction
C)free electrons
D)charging by conduction
3
Charging an object without touching it is _____.
A)charging by induction
B)charging by conduction
C)charging by grounding
D)charge separation
4
Coulomb's law gives the _____ between two charged bodies.
A)current
B)mass
C)distance
D)force
5
Why must Coulomb's law be modified for charged wires?
A)A wire cannot have induced charge.
B)A wire does not hold a charge.
C)Coulomb's law is valid for a point charge.
D)A sphere needs to be present.
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