Electric Fields

Electric Fields

1. Electrostatic Force

   • Directions of which on Positive and negative charges
   • Definition by Coulomb's law

2. Electric field intensity

   • In a Uniform Field as Potential gradient
     • The minus sign: Indicates the Force on unit charge is opposing the direction of displacement.
     • Applicable in a uniform field only
   • Definition
     • "The electric field intensity is the force on a unit positive charge placed at that point in the field".
   • In a radial field
   • Neutral point
     • Similar Like Charges
     • Similar Unlike Charges
     • Dissimilar Like Charges
     • Dissimilar Unlike Charges

3. Electric Potential

   • Definition
     • "Work needed to be done on a unit positive charge to be brought to a point from infinity"
     • is a scalar. However the sign is used along the charge
   • Graphs
     • Around a Positive Charge
     • Around a Negative Charge
   • Potential energy
     • Definition
     • Energy Difference/ Work done
       • on a Positive Charge
       • on a negative charge
     • Equi potential surfaces
       • Charge exchange
       • Field Intensity ratio

4. Facts

   • Objects can be Shielded from electric fields
   • are dependent on medium
   • Number of field lines entering a dipole object is equal to the number that leaves

5. Links

   • Field Lines http://dmr-physicsnotes.blogspot.com/2012/11/properties-of-electric-lines-of-force_21.html

6. Gauss' Law and its apllications

   • Flux model

7. Capacitors

8. Specific regions

   • Infinitely large plates
     • Conducting
     • Non Conducting
   • Infinitely long rods
   • Spheres
     • Conducting
     • Non Conducting