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Electric Fields (Electric Field Strength (Radial Field (Positive sphere -…
Electric Fields
Electric Field Strength
Every charged object creates an electric field in the region around itself, a charged object in this region experiences a force
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The Electric Field Strength at a point in the field is defined as the force per unit charge on a positive test charge placed at that point.
Radial Field
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If a positive sphere is placed next to a negative sphere, the lines will join up as the fields are attracted to one and other
However, if the spheres have the same charge. the lines and fields are repelled from one and other
Equipotentials
Equipotentials are lines that join together all the points with the same electric potential, they run perpendicular to field lines .
No work is done when travelling along an equipotential as they are the same distance away from the source of the charge
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Coulomb's Law
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Permittivity
The force between charges depends on what separates them, to take this into account, a medium is said to have permittivity.
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