Physics 1
Mr. Densmore
Name_________________
Coulombs Law “Conceptual” Worksheet
Fe  k
q1q2
2
r
1 coulomb (C) = 6.25 X 1018 electrons
Elementary charge = 1.60 X 10-19 C
K= 9.0 X 109 N • m2/C2
If the distance between two charges is doubled, what will happen the
force between the charges?
1.
2. If the distance between two charges is tripled, what will happen the force
between the charges?
3. If the distance between two charges is quadrupled, what will happen the
force between the charges?
4. If the distance between two charges is halved, what will happen the force
between the charges?
5. If the charge on q1 is doubled, what will happen to the force between the
two charges?
6. If the charge on q2 is doubled, what will happen to the force between the
two charges?
7. If the charges on q1 and on q2 are doubled, what will happen to the force
between the two charges?
Coulomb’s Law Problems
1. How many excess electrons are on a ball with a charge of
–4.00 X 10-17 C?
2. A strong lightning bolt transfers about 25 C to earth. How many electrons
are transferred?
3. A distance of 15 cm separates a positive and negative charge, each of
magnitude 1.5 X 10-5 C. Find the force on each of the particles.
4. How far apart are two electrons if they exert a force of repulsion of 1.0 N
on each other?