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Field lines

Show direction of force acting on stationary charge in a field 

- never cross 

- spacing proportional to field strength 

arrows show direction 

Force per unit positive charge in an electric field

SI unit: N/C

E=F/Q where E=change in v/change in d

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Uniform electric fields

Force on a charge in a uniform field is the same everywhere

E= change in p.d. Across plates/ plate separation

Unit: V/m or N/C

+ve charge moves in direction of field

-ve charge moves against direction of field

follows parabolic path when fired perpendicular to field 

path before/after is straight as no resultant force is acting