Electric Fields

Unit 4 - AQA A

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  • Created on: 07-01-13 13:22
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PHY4A
Electric Fields
And electric field is a region around a charge in which another charge feels a force. Unlike
gravitational fields, the forces can either be attractive or repulsive.
Coulombs law
The force between two charges is directly proportional to the product of the charges nd
inversely proportional to the square of their separation.
The law is usually summarized in a diagram like this:
The law gives this equation:
1 Q1Q2
F = 4 0 r²
Where q1 and q2 are the charges and r is their separation.
Note:
If the charges are alike, the force is repulsive
If the charges are unlike, the force is attractive
The charges should be small in comparison with their separation
R should be measured from the centre of the charges
Electric field lines
As with gravitational fields, lines are used to represent electric fields.

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PHY4A
Note:
At any point, the lines show the direction of the force on a positive charge placed at that
point.
As a consequence, field lines around a point of positive charge and a point of negative
charge are in different directions.…read more

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