Download Honors Physics Electrostatics Worksheet #2

Honors Physics Electrostatics Problem Set #1
1. A +2 µC and a +10 µC are 3 cm apart.
a) Find the electrostatic force between
the charges.
b) If the charges are brought together
and touched, what would be the
charge on each one?
c) These spheres are then moved 3
cm apart. What would be the
force between them?
2. Two equal charges experience a
repulsive force between them of
1 x 102 N when they are 3.0 cm
apart. Calculate the magnitude of the
charges.
3. Two identical point charges are
separated by a distance of 3.0 cm
and they repel each other with a force
of 4.0 x 10-5 N. What is the new force
if the distance between the point
charges is doubled?
4. If two identical charges of 1 C each
are separated by a distance of 1 km,
what is the force between them?
5. a) Two point charges are separated by
10.0 cm. If one charge is +20 µC and
the other is –6 µC, what is the force
between them?
*b) They touch each other and are
once again placed 10.0 cm apart.
What is the force between them now?
6. Determine the electrostatic force of
attraction between a proton and an
electron that are separated by
5.00 x 10-7 m.
7. Find the force between two charged
spheres 1.25 cm apart if the charge
on one sphere is 2.50 µC and the
charge on the other sphere is
1.75 x 10-8 C.
8. Two identical point charges are 3.00
cm apart. Find the charge on each of
them if the force of repulsion is
4.00 x 10-7 N.
9. A charge of 4.0 x 10-5 C is attracted
by a second charge with a force of
350 N when the separation is 10.0
cm. Calculate the size of the second
charge.
10. The electrostatic force between two
protons is 5.2 x 10-9 N. How far apart
are they?
11. Two equally-charged pith balls are 3
cm apart in air and repel each other
with a force of 4 N. Compute the
charge on each ball.
BONUS
12. *Two equally-charged conducting
spheres A and B repel each other
with a force of 2 N. Another identical
sphere C is touched to A then moved
over right next to B.
a) What is the force on A now ?
b) If C is now placed halfway between
A and B, what is the force on C?
13. **A 2.2 µC charge is located on the x
axis at x = -1.5 m. A 5.4 µC charge is
located on the x- axis at x = 2 m and
a 3.5 µC charge is located at the
origin. Find the net force on the 3.5
µC charge.
14. **a) Three particles are placed on a
straight line. The left particle has a
charge of +4.6 µC, the middle particle
has a charge of -2.3 µC and the right
particle has a charge of -2.3 µC. The
left particle is 12 cm from the middle
particle and the right particle is 24
cm from the middle particle. Find the
total force on the middle particle.
b) The left particle in the problem
above is moved directly above the
middle particle, still 12 cm away.
Find the force on the middle particle.