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Electric Field Strength (E) at a point
This is the force (F) that would occur if 1 positive Coulomb (Q) was placed at that point:
E = F/Q. E = Force/(+)charge. Unit: Newtons per Coulomb (NC-1)
(Note: E-fields created by a single, negative charge are always negative because they attract any positive charge placed in the field. (Positive charge creates a repulsive (+ive) E field.)Rearranging E = F/Q gives the Electric Force (F) acting on a charge Q in a Field (E): F = EQ
Coulombs law
The force between two point charges (Q1 & Q2) placed r meters apart in a vacuum is given byF = k.Q1Q2/r2 where k = 1/4πεo .
Electric Field lines
These show the ‘direction in which a free positive charge will move’. The electric field lines between two parallel charged plates are parallel (and run +V to -V).The electric field lines from a positive point charge lie in a ‘star’ pattern (pointing outwards).
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