Download I - SummerPhysicsDE

Notes: Coulomb’s Law
What is the law of electric charge?
Describe the properties of electric forces.
Electric Forces
Relationship to distance
Relationship to charge size
Types
Coulomb’s Law
Compare to Gravitational
Force
Units
Coulomb’s Constant
Practice Problems
1. What is the magnitude and direction of the force between two identical 10 microcoulomb charges 0.015-m
apart?
2. A 2C charge and a 4C charge attract each other with 10 N of force. By what factor with their attraction
increase if the 4 C charge is changed to an 8 C charge?
a.
Quadrupled b. doubled
c. remains the same d. halved
3. Consider the electric force between a pair of charged particles a certain distance apart. By Coulomb's law:
a. If the charge on one of the particles is doubled, the force is (unchanged) (halved) (doubled)
(quadrupled)
b. If, instead, the charge on both particles is doubled, the force is (unchanged) (halved) (doubled)
(quadrupled)
c. If instead the distance between the particles is halved, the force is (unchanged) (halved)
(doubled) (quadrupled)
d. If the distance is halved, and the charge of both particles is doubled, the force is ___________ as
great.
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