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WEEK 3
Electric Field
CONTENTS
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- Electric Field
- Coulomb’s Law
- Electric Field Intensity
- Electric Potential
ELECTRIC FIELD
An electric field is a region of space which surrounds a system of electric charges. Electrical forces will act on any electric charge which is placed within the region. Electric field is a vector quantity. The direction of the filed can be determined using a test charge (a small positive charge)
Fundamental Law of Electrostatics
The fundamental law of electrostatic states that: “Like charge repels, unlike charges attract.
COULOMB’S LAW
Coulomb’s law states that the force between two-point charges is proportional to the product of their charges and inversely proportional to the square of the distance between them.
Mathematically,
F α q1q2/r2
F =k q1q2/r2
Where k =1/4πɛ◦ = 8.99×109
Thus,
F = q1q2/4πɛ◦r2
ELECTRIC FIELD INTENSITY OR STRENGTH (E)
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