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What is an electric field?
a region where charged particles are subject to an electrostatic force
What kind of fields do point charges have?
radial fields, looks like spokes of a wheel
Which way do field lines point?
as if the charge was positive, towards negative charge, away from positive charge
What is electric field strength?
force applied per unit charge on an object
What is Coulomb’s law?
any two point charges exert an electrostatic force between them that is proportional to the product of their charges and inversely proportional to the square of the distance between them
What is the permittivity of free space?
8.85×10^-12, constant that defines the ability of a vacuum to become polarised and store charge
What is relative permittivity?
a constant - multiply by the permittivity of free space to find the permittivity of a material
What are the differences and similarities between gravitational and electric fields?
different properties that creates the field, repulsive and attractive vs attractive, force per unit POSITIVE charge vs force per unit mass, similar laws, similar force and field strength and energy, both produce a radial field
What is an example of a uniform electric field?
between two parallel oppositely charged plates
What makes an electric field uniform?
constant force no matter where the particle is in the field
What is electric potential?
work done per unit charge to bring a positive charge from infinity to that point
How can you model motion of a charged particle in a uniform electric field?
similar to gravitational field, like projectile motion
What is area under a force distance graph?
work done/electrical energy
What is Coulomb’s law?
What is the equation for uniform electric field strength?
E=V/d
What is capacitance for an isolated sphere?
C=4piR
What is the derivation of C=4piR?
What is area under a force-distance graph for a point or spherical charge?
work done
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