Electric fields summary notes

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Electrical fields
Pushing charges
A region of space that accelerates charged particles is said to have an electric field
A force will be exerted on a charged particle when it is within that field, to visualize this we draw
electric field lines. These show the direction a positively charged particle would move if placed
within it, the closer the lines the stronger the field.
The force the charged particle experiences is the electric field strength (E) multiplied by the
amount of charge on the particle (Q). Therefore:
Every location within a field has a certain potential energy (how much energy the particle can
gain via kinetic energy). When the particle moves to a different part of the field it has a different
amount of potential energy. The distance between these two points is known as the potential
Potential difference can be defined as "the energy transferred per
coulomb of charge passing through a device". It is the same for
electric fields the amount of energy transferred to a particle as it
moves through a field. This is given by the equation:
Uniform Fields
An electric field will exist between any objects which have different
electrical potential. So if we connect metal plates to a power supply we can create an electric
field between them..
The strength of a uniform electric field is a measure of how
quickly the potential changes. This gives rise to the equation:
The SI units for electric field strength chart are NC1 or VM1

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Points within an electric field which have the same potential can be connected by lines called
equipotentials. The field will always be perpendicular to the exponential lines, as a field is defined
as a region which changes potential.
Field lines never cross.
The distance between equipotential lines tells you the strength of the field at that point.…read more


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