Download III

III
Electric Fields
A. Electric Field (E) – a field created by a charge
1. Not a force, similar to gravitational field
2. the possibility to get electric force if another charge is present,
3. an E field is a force you can get per amount of charge
4. Units (N/C) Newtons per Coulomb
5. Electric Fields are a vector quanity, where field lines are drawn to
represent the field
6. Field lines around a positive charge, negative charge, two similar sharges,
two opposite charges
B. Rules for line Drawing
1. Always draw lines based on how a positive test charge would act.
2. field lines never cross
3. when more than 1 charge is present, lines interact causing curved patterns
4. Number of lines drawn is proportional to the charge
5. Field is strongest where the lines are close together.
C. Electric Fields between parallel plates
1. Two oppositely charged plates create an Electric Field
2. The field in uniform (equal at all locations in the field)
3. Electrons and protons moving through the field get deflected (draw)
D. Electric Fields in a Conductor
1. Charge builds up on the surface of a conductor
2. Hollow conductors have no E field inside, all charge on surface.
3. Charge builds up on sharp points (draw picture)