Chapter 9: Electrostatics Review Flashcards
Do Protons and Electrons carry the same amount of charge? If so what value?
Yes, they carry the same but opposite charge. C= 1.6x10^-19
What is the letter for charge?
Q, and charge can only be presented in whole numbers
What is Coloumbs law? What trends can we see?
Determines the force between two charges present. The force is proportional to charge and inversely related to the distance.
What is the equation for Coloumbus law?
F(e)= (k)(q1*q2)/r^2 Where K, is a constant and equals (9x10^9)
What happens when there are three charges? How do you calculate the force on the 3rd charge?
Principle of Superposition, where you find the effect on one charge, and then on the second, and then add them together.
What is the electric field?
The field is created by a source charge, and can influence the area around it.
How do positive charge fields behave? Negative
Positive fields allow for field lines to move away while negative field lines to follow in.
What is the equation for an electric field?
E= (k)(Q/r^2), where K again is coloumbs constant
What force does the charge feel within an electric field?
F=(Q)(E) where the charge is multiplied by the electric field value
Does the same distance around an electric field have the same energy?
No, the electric field is a vector quantity. All those points have the same energy but in different directions
Conductors
Usually made of metal and have delocalized electrons that can be influenced by outside electric forces.
Insulators
Do not have free electrons and as a result of an outside electric force will create the polarization.
What is the electric potential?
The potential energy the charge has in the presence of an electric field. It is a scalar quantity and has the same value all throughout the field (at a particular distance)
What is the equation for electric potential? Units?
ø= K(Q/r) and the unit is volt.
How to calculate the change in potential energy within a field?
PE=(Charge)(Change in voltage)
