Electric Charge
What is the basic unit of electric charge?
Coulomb (C)
Which common household material is a poor conductor?
Plastic
Name two common insulating materials.
Rubber, glass. wood, plastic
What does Coulomb's law describe?
The force between two charges
What is the direction of the electric field created by a positive charge?
Away from the charge
What type of charge is carried by an electron?
Negative (-)
Name at least one common material that is a good electrical conductor.
Metals (found in Periodic table), copper, aluminum, silver, gold, steel, sea water.
Why is plastic commonly used to insulate electrical wires?
It is a poor conductor
What is the formula for Coulomb’s law?
F= Kq1q2/r^2
How does the electric field strength change if the charge is halved?
The electric field strength is halved.
If an object has equal numbers of protons and electrons, what is its net charge?
Zero (neutral charge)
What subatomic particle moves freely in a conductor?
Electron
Why are insulators used to coat electrical wires?
To prevent electric shocks.
What happens to the electrostatic force between two charges if both charges are increased?
The force increases.
What happens to the electric field if the distance from the charge is tripled?
The electric field is reduced by a factor of 9.
What is the charge of a single proton in coulombs?
1.6 x 10^-19 C
What is a conductor in terms of electricity?
A material that allows electric charges to flow easily through it.
What is an insulator in terms of electricity?
A material that does not allow electric charges to flow easily.
If two charges of +3μC and −2μC are placed 1 meter apart, what is the force between them?
0.054N
A +2μC charge creates an electric field. What is the electric field at a point 0.3 meters away from the charge?
2.0x10^5 N/C or 200000 N/C
Two objects have charges of +3μC and −6μC. What is the total charge when these objects are brought together?
-3μC
What is the full name of your Student Teacher in General Physics?
Angelica S Gomez
Which property of an insulator allows it to block the flow of electricity?
High resistivity
Two point charges, q1=+6μC and q2=−3μC, exert a force of 0.72 N on each other. What is the distance between the two charges?
0.4743m
A charge of +8nC creates an electric field at a point. What is the electric field at a distance of 5 meters from the charge?
2.88 N/C