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Physics Test
Static Electricity and Electric Fields Study Guide
In the space to the left, write the letter of the answer to each question
___ 1. The strength of the force on a charge in an electric field depends on
___ 2. In a uniform electric field, the potential difference between two points is found using the
equation
___ 3. An electric field is equal to
___ 4. Touching an object to the Earth to eliminate excess electrical charge is
___ 5. The charges on a hollow conductor are found
__ 6. A capacitor is
____ 7. Bits of paper stick to a plastic comb that has been rubbed because of
____ 8. An important difference between insulators and conductors is that in conductors
____ 9. When electrons are transferred from one object to another, positive and negative charges are
____ 10. The force that charge q1 exerts on q2 is opposite and _______ the force that charge q2 exerts on
q1.
Answer in two or three complete sentences.
11. Why do socks and other pieces of clothing stick together after being tumbled in the dryer?
12. Distinguish between charging by conduction and charging by induction.
13. Explain why electric potential energy is larger when two like charges are close together than when
two unlike charges are closer together.
Solve the following problems.
15. A positive charge of 3.6 x 10-5 C and a negative charge of – 2.4 x 10-5 C are 0.034m apart. What is
the force between the two particles?
16. The drawing shown indicates three charges and their separation. Find he net force on charge B,
magnitude and direction
A
-3.6 x 10-5C
0.360m
B
2.1 x 10-5C
1.140m
D
8.5 x 10-5C
17. Draw the electric field lines for a hollow sphere with a charge of +6 coulombs and a radius of 2 cm
and the electric field of a hollow sphere with a charge of –2 coulombs with the same radius.
18.A 15 volt battery is connected to a flashlight. If 3 coulombs of electricity pass through the wire from
one terminal to the other, how much energy is available for the light?
19. Know your units