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Electric Field
Vector field surrounding charged particles excepting attractive and repulsive forces on each other
Test Charge
charge used to measure the strength and direction of electrical fields
Electric Field Unit
Newtons per Coulomb
Force vs Field
Field is independent of a test charge
Micheal Faraday
came up with the concept of electric field lines, providing a visual representation of the field
Electric field lines
Imaginary lines used to visualize the direction and strength of an electric field at any point
Electric Field equation
E=1/4pie0 x q/r2r
Principle of Superposition
net response caused by multiple stimuli is the sum of the responses that would have been caused by each stimuli individually
Electric field magnitude equation
E=1/4pie0 x q/r2
Electric Dipole
when two patters of electric field lines have the same magnitude but opposite signs
Electric dipole moment
magnitude from the product of charge and distance
Dipole field vs single charge field
distance decreases more rapidly due to equal magnitude and opposite charges, the charges almost cancel
How is the charge of larger objects calculated?
through integration, E=qz/4pie0(z2+R2)3/2
At what point is net charge 0?
center of a ring when z=0
Electric field ring (equation)
E=qz/4pie0(z2+R2)3/2
External Field
exists outside a defined system or object and affects it without being an inherent property or part of the system itself
Electrostatic field equation
F=qE
Millikan
First to measure the elementary charge
At what point does electrical breakdown occur?
When magnitude reaches the value Ec and the field begins to remove electrons from the air
Dipole Torque equation
t=pe
Potential energy of a dipole (equation)
u=-pe
Point charge
hypothetical charge located at a single point in space
How do field lines behave?
extend away from positive charge (origin) towards termination site (negative charge).
