Chapter 4- Electric Fields Flashcards
What is a field
It is a region of space that experiences a force
Electric field strength
Is the electric force per unit charge
N/C
What happens with a uniform electric field
The lines of the electric force are evenly spaced and they are parallel
The value of electric field strength everywhere in the uniform field is the same
Another way of expressing the electric field strength in a uniform electric field…
E= V(potential difference between the oppositely charged plates) / the distance between them
Equipotential lines
Work isn’t done in moving a charged object along an equipotential line
But it is done when moving between lines
Work= QV(between equipotential lines)
Examples of electrostatic use
Microwave oven
Liquid light displays
Electrostatic precipitators
Crop spraying
Attracting things you want or don’t want to go where you want it to go
Dipoles that want to lie along electric field but with the field constantly switching then the dipole twists (as it’s ends are oppositely charged)
Radial electric fields centre out from the….
Proton
Electric field strength eq
E= kQ/r^2
K= 1/4pieęo = 8.99x10^9
Coulomb’s law constant
Electric. Field eq with potential difference
E= V/d(distance between two plates in uniform field)
In radial fields what is equation for electric potential eq
E= kQ/r^2
Therefore
V=kQ/r
If in a radial field you need to find potential difference between two points what is eq?
🔺V= kQ( 1/r1-1/r2)
