SAT II Physics : Electricity and Magnetism
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Example Questions
Example Question #1 : Electric Circuits
If a circuit contains a 
Ohm's law states:
Where 
We can substitute the given values from the question into the equation and solve:
Example Question #1 : Electric Circuits
There are three resistors in parallel in a circuit with resistances of 
What is the equivalent resistance?
The equation for resistors in parallel is:
We are given the values of the resistors. Using this formula, we can solve for the equivalent resistance.
Plug in the given values and solve.
Example Question #2 : Resistors
A voltage of 
This question can be solved using Ohm's law:
We are given the voltage and the current. Using these values, we can solve for the resistance.
Example Question #2 : Electric Circuits
A capacitor with capacitance 
Capacitance of a circuit is defined by the equation:
Where 
Since the metal plates are cut in half, the area is halved. We can substitute 
The result is that the capacitance is half the original quantity.
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 quartered
be halved
remain unchanged
quadruple
double
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 : Electricity And Magnetism
On which of the following does the amount of work required to move a charge in an electric field depend?
Neither the potential nor the path traveled
Only the path traveled
Both the potential and the path traveled
Only the magnetic field
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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