Bell Work: Electric Fields Electric field lines point towards ( negative / positive ) charges. There are fewer lines when a field is ( strong / weak ). Field lines are ( straight / curved ) when charges interact. Attraction is shown when field lines curve ( towards / away from ) each other. A ( positive / negative ) test charge will move in the direction of the arrows.

Electric Field Calculations

Magnitude (strength) of the electric field (E) can be calculated using E = magnitude of electric field – unit is Newtons per Coulomb (N/C) F = electric force – unit N q = charge of body – unit is C

It takes work to move a charge against an electric field. This work done per unit of charge is called potential difference. Unit for potential difference is the volt (V).

W = Work (or potential energy) (J) Q = charge (C) The equation for calculating voltage is: symbols units V = voltage (V) W = Work (or potential energy) (J) Q = charge (C)