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Example Questions
Example Question #2 : Coulomb's Law
If the distance between two charged particles is doubled, the strength of the electric force between them will __________.
be halved
be quartered
double
quadruple
remain unchanged
be quartered
Coulomb's law gives the relationship between the force of an electric field and the distance between two charges:
The strength of the force will be inversely proportional to the square of the distance between the charges.
When the distance between the charges is doubled, the total force will be divided by four (quartered).
Example Question #1 : Electric Potential Energy
On which of the following does the amount of work required to move a charge in an electric field depend?
Only the magnetic field
Only the path traveled
Neither the potential nor the path traveled
Both the potential and the path traveled
Only the change in potential
Only the change in potential
Work done by electric field is defined:
Notice that the only variable in the equation is the potential, so this is the only quantity on which work depends.
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