Change in Electric Potential: If the particle moves through a potential difference ΔV, the change in the electric potential energy is
Work by the Field: The work W done by the electric force as the particle moves from i to f:
Conservation of Energy: If a particle moves through a change ΔV in electric potential without an applied force acting on it, applying the conservation of mechanical energy gives the change in kinetic energy as
Work by an Applied Force: If some force in addition to the electric force acts on the particle, we account for that work
5) A Point charge in an Electric Field If a particle with charge q is placed in an external electric field E, an electrostatic force F acts on the particle
If more than one charged particle sets up an electric field at a point, the net electric field is the vector sum of the individual electric fields— electric fields obey the superposition principle.
(2) A closer spacing means a larger field magnitude.
(1)The electric field vector at any given point must be tangent to the field line at that point and in the same direction,
Electric field lines due to attraction and repulsion of charges.
Electric field lines extend away from positive charge (where they originate) and toward negative charge (where they
The SI unit for the electric field is newton per coulomb (N/C)
The electric field E at point P due to a charged object can be defined as
An Electric field is a vector field
and if they have different charges, they attract
if q1 and q2 have the same charge, they repel
Coulm's law benefits : calculates the electric force that electric charges exert on each other and are separated by a distance
(Coulomb constant)
k = 8.99×109 N.m2/C2
Thus k = 1/4πε0
Definition:The attractive interaction between any two charged bodies
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