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Electric Fields and forces
see above
23
Physics
12th Grade
04/14/2008

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Cards

Term
What are the two types of charges?
Definition
Negative + Positive
Term
like charges = ?
Definition
repel ("like dislike")
Term
opposite charges = ?
Definition
attract ("Opposites attract")
Term
Electric Charge is always _______
-Give example
Definition
Conserved
-Loss of electrons by hair is equal to the amount gained by the balloon
-cannot create or destroy charge
Term
Millikan
Definition
The person who performed the oil drop experiment.
Term
Oil Drop Experiment
Definition
Millikan used negatively charged oil droplets and let them go through a tiny hole in a metal plate. Millikan then charged the plate in the above the drop, causing it to become attracted towards it. By repeatedly doing this, he could make the oil drop "dance" and be suspended in midair. As a result he was able to calculate the charge on an electron.
Term
e
Definition
the charge on an electron
Term
the charge on an electron
Definition
-1.60x10^-19 C
Term
Unit of electric charge
Definition
Coulomb (C)
Term
The force electric is affected by 2 things, what are they?
Definition
-The magnitude of the charge
-The distance between the particles
Term
field force
Definition
a charged particle's region of influence
Term
examples of field forces include...
Definition
gravity and the force electric
Term
Similarities and differences between gravity and the force electric.
Definition
Fg can only be positive and is weaker.
Fe can be positive or negative and is stronger
Term
insulator
Definition
does not conduct a charge
Term
conductor
Definition
conducts a charge
Term
electric field
Definition
a region where an electric force on a test charge can be detected
Term
Induction
Definition
the process of charging a conductor by bringing it near another charged object and grounding the conductor
Term
An object can be charged by... (3 ways)
Definition
-contact
-induction
-polarization
Term
Polarization
Definition
-occurs with insulators
-involves a realignment of charge
-no net charge
Term
a positively charged particle has an _____ directed field
Definition
outwardly
Term
a negatively charged particle has an _____ directed field
Definition
inwardly
Term
the three things to remember about electrostatic equilibrium are...
Definition
-the electric field is zero everywhere inside the conductor
-the electric field is perpendicular to the conductor's surface
-on an irregularly shaped conductor, charge tends to accumulate where the radius of curvature of the surface is the smallest (at sharp points)
Term
electrostatic equilibrium
Definition
no net motion of charge is occurring within a conductor
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