6.2 Flashcards
Electric field
Region around a body in which other charged bodies will feel a force due to the electric charge of the body
Electric field lines
Show the shape of the field and direction at any point in the field that a small positive charge (test charge) would move
Electric field strength
Force per unit charge, force a charge of +1C would feel if placed at this point in the field
Coulomb’s Law
Electrical force between 2 point charges is directly proportional to the product of their charges and inversely proportional to the square of their separation
Equation for force between to particles
Qq/(4piE•(r^2))
=+ve = repulsion =-ve = attraction
Permittivity
Constant for an object related to the ability of a capacitor to transfer charges through it, relative to that of a vacuum
E = E(r) * E(o)
How does a capacitor store energy
E =V/d
Energy released/stored by a charge moving across the distance between plates of a capacitor
How do particles move in between charged plates
Motion parallel to field lines:
Continue to move parallel to field and straight across plate to plate
Component perpendicular to field lines:
Suvat motion applied, horizontal speed constant, vertical speed changes with acceleration of particle in field
Electric potential
Work done per unit charge to move that charge from infinity (potential of 0) to a point in the field
Electric potential energy
Work done to move a charge from infinity to a point in the field
Permittivity of free space
Physical constant related to the size of force between electric charges in free space
Relative permittivity
The factor by which the capacitance of a capacitor with a given material between its plates is increased relative to the capacitor with a vacuum between its plates
