Download Electrostatics Test Review

Week 27 CCA/Unit Test Review
Define the following Terms:
Plane Mirror
Concave Mirror
Convex Mirror
Convex Lens
Concave Lens
Converging Lens
Diverging Lens
Reflection
Refraction
Diffraction
Incident Ray
Reflection Ray
Focal Point
Law of Reflection
Focal Length
Force
Electrostatics
Conductor
Insulator
Charge
Induction
Grounding
Conservation of Charge
Conduction
Mirrors
1. What is the Law of Reflection?
2. What are the characteristics of the image formed by a plane mirror?
3. What causes refraction of light?
4. If you are using a concave mirror, how will the image appear?
5. If you are using a convex mirror, how will the image appear?
6. What are the three primary colors of light? What color is formed when the primary colors of
light are combined?
Lenses
1. What are the characteristics of the image formed by a thin convex lens?
2. How is the ray diagram used to determine the characteristics of the image formed by a convex
lens?
3. Compare converging and diverging lenses.
4. Distinguish between a real image and a virtual image.
Lens Calculations
1. An object is placed 20m from a converging lens of focal length 70m. How far from the lens will
the image be formed?
a. 28m
b. 0.036m
c. -28m
d. 15.56m
2. Based on the answer from above, explain the orientation of the image and the type of image
you will see.
a. Real and Inverted
b. Real and Upright
c. Virtual and inverted
d. Virtual and upright
3. A convex lens is 24m away from an image. The object’s distance is 8m behind the lens. What
is the focal length of the lens?
a. -6m
b. 0.167m
c. 6m
d. -0.167m
4. Use the thin lens formula to calculate di if the focal length is 20m and do is equal to 15m.
a. 8.57m
b. 60m
c. -0.017m
d. -60m
5. An object is placed 40 m from a convex lens. An image is formed 20 m from the lens. What is
the focal length of the lens?
a. 10 m
b. 16 m
c. 13 m
d. 7 m
Electrostatics
1. What is Coulomb’s Law? How are the variables in the equation related to one another?
2. What are the properties of a conductor? What are the properties of an insulator? How do their
electrons behave? What are semiconductors?
3. What is the fundamental rule involving charge at the base of all electrical phenomena?
4. What is transferred between atoms/charged objects, electrons or protons?
5. Describe what happens when you charge an object by friction, contact, or induction. Give
examples of each.
6. An electric _ _________can be positive or negative and can exert a force over a distance. The SI
unit of charge is the ________ ___.
7. The charge of a single proton is ________________C and the charge of a single electron is
________________C.
8. If two oppositely charged objects are brought near each other they will ________ each other. If
two like charged objects are brought close together they will _______ each other.
9. Electric field lines flow _______ of positive charges and _______ negative charges. No two field
lines ever _________. The field is ____________when the lines are close together and
____________ when the lines are further apart.
10. Use Coulomb’s Law to determine what happens to the force between two charged objects if a. one of the charges is doubled? _____________
b. both of the charges are doubled? _______________
c. the distance is doubled? ______________
d. the distance is halved? _______________
e. both the charges are doubled and the distance is halved?
_________________
Electrostatic Problems
1) Two positive charges of 4x10-12 C are located 0.05 m apart. What is force between the two
charges?
2) A proton and an electron are placed in an electric field at a distance of 0.1 m. Calculate the force
of attraction between the two particles.
3) A positive charge of 3x10-9 C and a negative charge of 2x10-7 C are located 0.015 m apart. What is
the force between the two charges?