Chapter 15 Review
Check out the interactive electric charge test on the Physics webpage.
15.1 – Electric Charge
What is the “law of charges”?
Define “conservation of charge.”
How many electrons constitute a net charge of -1.0 C? (Use q = n*e)
What is the unit of charge?
15.2 – Electrostatic Charging
Define the following terms:
-Conductor
-Insulator
-Semiconductor
Describe the following methods of charging:
-Charging by friction
- How does the triboelectric series relate to this method of charging?
- Two objects are rubbed together. Will the charge on the object higher up on the triboelectric series be positive or negative?
-Charging by conduction
- Will the charge be the same or opposite of the rod?
-Charging by induction
- Will the charge be the same or opposite of the rod?
Define polarization.
How does an electroscope work?
15.3 – Electric Force
What is Coulomb’s Law?
What are the units of k?
Two protons are 50 nm apart. What is the electrostatic force acting on them? In what direction is it acting?
There are two point charges of + 5.0 C at 0 and 1.0 m on the x-axis. What is the net force acting on a single electron located at 0.50 m? 0.75 m? 2.0 m?
What happens to the electrostatic force if:
-One charge is doubled
-Both charges are doubled
-The distance is doubled
-Both charges and the distance are doubled
15.4 – Electric Field
What is an electric field?
A positive charge is place in an electric field pointing directly upward. In what direction would an electrostatic force act on that charge? In what direction would an electrostatic force on on a negative charge?
What are the equations used to calculate the electric field?
What is the “superposition principle for electric fields”?
What is the electric field 2 cm away from a + 500 nCcharge. What direction is the field?
Two identical charges (- 4 mC) are located on the x-axis at 0 and 2.0 m. Where is the electric field zero? What is the electric field at -1.0 m on the x-axis?
Sketch a diagram of the electric field of a dipole.
What is the equation for the electric field between two parallel plates?
A capacitor is a set of two parallel plates that can be charged. If the area of each plate is 5 mm2 and the positive plate contains a charge of 60 nC, what is the electrostatic force would act on an electron placed in the field?
15.5 – Conductors and Electric Fields
What is the electric field inside a conductor?
Where reside excess electric charges reside on a conductor?
What direction is the electric field on the surface of a charged conductor?
Why does lightning tend to strike lightning rods?
Why is it safe to stay in your car during a lightning storm?