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AP Physics Electrostatics Review
1.
Determine the following:
a. Mass of proton _______________ Mass of electron _______________
b. Charge of proton ______________ Charge of electron ______________
2.
Fill in the symbol and units for the following:
a. Charge _______________
b. Electrical force _______________
c. Electric field _________ or ________________
d. Electric potential or potential difference ____________________
e. Capacitance _____________________
3.
Three point charges are placed on the x-axis as shown. Find the net force on the
-3 C charge. Charge A is 4 meters from Charge B and 10 meters from Charge C.
Charge A = C
Charge B = C
Charge C = C
4.
Two identical pith balls, each of mass 0.1 grams, carry identical charges and are suspended by two
threads of equal length as shown below. The angle between the threads is 60 0. Find the charge on
either ball.
5.
Three identical charges of +4 C are placed at 3 of the 4 corners of a square having sides of 40 cm.
a. Compute the E-field at the fourth corner.
b. Compute the potential energy of the system.
c. Compute the potential at the fourth corner.
d. Calculate the work needed to bring a proton to the fourth corner from infinity.
6.
Two parallel plates are connected to a 12 Volt battery. The distance between the plates is 2 x 10 -3
meters.
a. Draw a set of plates and the field between them.
b. Calculate the electric field between the plates.
c. How much energy would a proton gain if it is released at the positive plate and allowed to move
to the negative plate?
d. How fast is the proton moving?
7.
An air capacitor has an area of 80 cm2 and a distance between the plates of 2 cm.
a. Determine the capacitance of the capacitor.
b. If a dielectric having a constant of 1.5 is inserted into the capacitor, what is the new capacitance?
c. How much charge will be stored if the capacitor is connected to a 100 Volt
source?
d. How much energy is stored when connected to the 100 V source?
8.
A 10 F capacitor is connected to a 15 F capacitor. Calculate the equivalent capacitance if they are
connected
a. in series.
b. in parallel.