Chapter 21 Electric Charge And Electric Field Flashcards
What is the Net Amount Electric Charge produced in any process
Zero
Are an electron and proton equal in electric charge
Yes
What does it mean when you say that a water molecule is bipolar
It has a positive and negative charge at opposite ends
What is an ion
An atom having a negative or positive charge. The negative charge comes from acquiring extra electrons. The positive charge comes from losing electrons.
What can move in liquids and gases
What moves in solids
Ions, nuclei and electrons in gases and liquids
Electrons move in solids
Example of good insulator and why
Anything but metal. The electrons are bound very tightly in the atom
Example of conductor and why
Usually any metal. The electrons are not bound tightly in the atom and are free to move about, but can’t leave the material easily
Are there free electrons in a semi conductor. Examples of semi conductor materials.
Very few. Silicon, germanium and carbon
What is charging by induction
Bring a charged object close or touching so that the electrons move.
Describe an electroscope
Two moveable gold leaves connected by a conducting wire to a knob on the top of the case. The leaves are insulted from the case .
Does an electric charge exert a force on other electric charges
Which law allows you to calculate this force
State Coulomb’s Law
What are Q1, Q2,k and r
Yes
Coulomb’s Law
F= k(Q1*Q2)/r squared. This formula only applies to objects whose size is much smaller than the space between them
Q1 and Q2 are the charges on injects one and two
R is the distance between the two objects
K is the proportional constant. Today it has been replaced by the coulomb
What is the smallest charge in nature
Is it considered fundamental in nature
The electron charge
Considered fundamental in nature, given the symbol e and referred to as an elementary charge
