Electric field
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Examples
Lessons
- How to draw electric field line diagrams
Draw the electric field line diagrams for the following: - Calculations with electric field
A pair of positive and negative point charges are fixed in the following positions:
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Topic Notes
In this lesson, we will learn:
or equivalently, by substituting Coulomb's law:
∣E∣=kr2∣Q∣
E: electric field, in newtons per coulomb (N/C)
Fe: electric force, in newtons (N)
q: charge that experiences the field, in coulombs (C)
k: Coulomb's law constant, 9.00×109N⋅m2/C2
∣Q∣: magnitude of charge that creates the field, in coulombs (C)
r: distance from charge, in meters (m)
∣Fe∣: magnitude of electric force, in newtons (N)
k: Coulomb's law constant, 9.00×109N⋅m2/C2
∣Q1∣,∣Q2∣: magnitude of each charge, in coulombs (C)
r: distance between charges, in meters (m)
- Meaning of electric field and its relationship to electric force
- How to draw electric field line diagrams
- Solving problems with electric field
- Electric field (E) is the electric force exerted by a charge Q on another charge q, per unit charge of q. It is a vector quantity.
- By convention, the direction of electric field vectors is defined as the direction that a positive test charge would move if placed in the field. Fe points in the same direction as E for positive charges, and in the opposite direction of E for negative charges.
- A test charge is a point charge with a very small magnitude. Test charges have a small magnitude charge so that the electric field of the test charge is negligible and does not affect the electric field that is being investigated.
Electric Field
E=QFeor equivalently, by substituting Coulomb's law:
∣E∣=kr2∣Q∣
E: electric field, in newtons per coulomb (N/C)
Fe: electric force, in newtons (N)
q: charge that experiences the field, in coulombs (C)
k: Coulomb's law constant, 9.00×109N⋅m2/C2
∣Q∣: magnitude of charge that creates the field, in coulombs (C)
r: distance from charge, in meters (m)
Coulomb's Law (Electric Force)
∣Fe∣=kr2∣Q1Q2∣∣Fe∣: magnitude of electric force, in newtons (N)
k: Coulomb's law constant, 9.00×109N⋅m2/C2
∣Q1∣,∣Q2∣: magnitude of each charge, in coulombs (C)
r: distance between charges, in meters (m)
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